CONDUCTING SYSTEM OF HEART.pptx
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Heart is a muscular pumping organ .It effectively eject blood to the respective arteries by contraction of atrial followed by ventricular muscle fibers. but contracting stimulus is generated by SA node which is located in right atrium of heart. The pacemaker stimulus successfully reaches each ventricles by the stimulus transferring structure of heart.
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Conductive system of heart by Dr. Pandian M
The student will be able to: (MUST KNOW)
Name the parts of conducting system of the heart.
Appreciate the importance of AV nodal delay.
Explain the mechanism of AV nodal delay.
Give the conduction velocity in different cardiac tissues.
Understand the propagation of electrical impulse in conducting system of heart.
Conductive system of the heart rmc 2
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The document discusses the microstructure of the cardiovascular system. It begins by outlining the learning objectives which are to understand the histology of the heart including its structure, muscles, and conduction system. It then describes the layers of the heart walls including the endocardium, myocardium, and epicardium. It explains the specialized cardiac muscle cells and conduction system. Finally, it discusses the histological features of arteries, veins, and capillaries focusing on their layers and differences between vessel types.
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Conduction system of the heart
The conduction system of the heart generates and conducts electrical impulses to coordinate the rhythmic contraction of the heart muscles. It consists of the sinoatrial node, internodal pathways, atrioventricular node, bundle of His, and Purkinje fibers. The sinoatrial node acts as the natural pacemaker by initiating electrical impulses. These impulses then travel through the internodal pathways to the atrioventricular node, where they are delayed to allow the atria to contract before the ventricles. The impulse then travels down the bundle of His which splits into right and left bundle branches to coordinate simultaneous contraction of the ventricles.
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The conducting system of the heart consists of specialized cardiac muscle tissue that generates and transmits electrical impulses to initiate and coordinate heart muscle contraction. It includes the sinoatrial node, atrioventricular node, bundle of His, Purkinje fibers and their left and right branches. These structures work together to conduct electrical signals from the upper to lower chambers and allow synchronized, rhythmic pumping of blood throughout the body. Damage to parts of this system can lead to arrhythmias or require treatment like artificial pacemakers.
13.conducting system and fibroskeleton of heart.pptx
The conducting system of the heart is responsible for initiating and conducting electrical impulses to coordinate heart contractions. It consists of specialized cardiac muscle fibers including the sinoatrial node, atrioventricular node, bundle of His, and Purkinje fibers. The fibrous skeleton of the heart provides support and attachment points for the heart valves. It is composed of fibrous rings surrounding the atrioventricular, pulmonary, and aortic orifices that prevent dilatation and provide rigidity. The conducting system and fibrous skeleton work together to coordinate the pumping of blood through the heart.
Recommended
Conductive system of heart by Dr. Pandian M
The student will be able to: (MUST KNOW)
Name the parts of conducting system of the heart.
Appreciate the importance of AV nodal delay.
Explain the mechanism of AV nodal delay.
Give the conduction velocity in different cardiac tissues.
Understand the propagation of electrical impulse in conducting system of heart.
Conductive system of the heart rmc 2
Physiology of Excitatory and Conductive system of the heart including action potential in cardiac pacemakers and autonomic Control of Cardiac rhythm
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This slide describe generally anatomy of the heart, innervation of the heart and pressure of the heart
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The spinal cord is a long, thin bundle of nervous tissue located along the back and neck that connects to the brain. It receives and transmits electric signals throughout the body and back to the brain. The spinal cord is protected by vertebrae bones and cerebral spinal fluid. It has gray matter containing nerve cell bodies and white matter containing nerve fibers. The spinal cord is divided into cervical, thoracic, lumbar, and sacral sections that each control certain muscles. Blood supply comes from anterior and posterior spinal arteries as well as radicular arteries.
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The conduction system of the heart generates and conducts electrical impulses to coordinate the rhythmic contraction of the heart muscles. It consists of the sinoatrial node, internodal pathways, atrioventricular node, bundle of His, and Purkinje fibers. The sinoatrial node acts as the natural pacemaker by initiating electrical impulses. These impulses then travel through the internodal pathways to the atrioventricular node, where they are delayed to allow the atria to contract before the ventricles. The impulse then travels down the bundle of His which splits into right and left bundle branches to coordinate simultaneous contraction of the ventricles.
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The conducting system of the heart consists of specialized cardiac muscle tissue that generates and transmits electrical impulses to initiate and coordinate heart muscle contraction. It includes the sinoatrial node, atrioventricular node, bundle of His, Purkinje fibers and their left and right branches. These structures work together to conduct electrical signals from the upper to lower chambers and allow synchronized, rhythmic pumping of blood throughout the body. Damage to parts of this system can lead to arrhythmias or require treatment like artificial pacemakers.
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The heart is a hollow muscular pump located in the chest cavity. It has four chambers - two upper atria and two lower ventricles. The heart is surrounded by the pericardium and has three layers - epicardium, myocardium, and endocardium. It receives deoxygenated blood from the body and pumps it to the lungs for oxygenation, then receives oxygenated blood from the lungs and pumps it out to the body. The heart has valves that ensure one-way blood flow and a specialized conduction system that generates electrical impulses to coordinate contractions.
CONDUCTIVE SYSTEM OF HEART .pptx BY MRS. WINCY THIRUMURUGAN .PROFESSOR.NURSIN...
MEANING.
The conducting system of the heart consists of cardiac muscle cells and conducting fibers (not nervous tissue) that are specialized for initiating impulses and conducting them rapidly through the heart.
It provides the heart its automatic rhythmic beat.
The purpose is to
Generating rhythmical electrical impulses to cause rhythmical contraction of the heart muscle. Conducting these impulses rapidly throughout the heart.
This pathway is made up of 5 elements:
The sino-atrial (SA) node.
The atrio-ventricular (AV) node.
The bundle of His.
The left and right bundle branches.
The Purkinje fibers.
SINOATRIAL NODE
The sinoatrial (SA) node is a collection of specialized cells (pacemaker cells), and is located in the upper wall of the right atrium, at the junction where the superior vena cava enters.
These pacemaker cells can spontaneously generate electrical impulses. The wave of excitation created by the SA node spreads via gap junctions across both atria, resulting in atrial contraction (atrial systole) – with blood moving from the atria into the ventricles.
The SA node is supraventricular and is sensitive to parasympathetic and sympathetic influence.
The SA node generates impulses and influenced by the Autonomic Nervous System:
Sympathetic nervous system – increases firing rate of the SA node, and thus increases heart rate.
Parasympathetic nervous system – decreases firing rate of the SA node, and thus decreases heart rate
THE INTER NODAL PATHWAYS consist of three bands (anterior, middle, and posterior) that lead directly from the SA node to the next node in the conduction system, the atrioventricular node. The impulse takes approximately 50 m s (milliseconds) to travel between these two nodes.
Bachmann's bundle (BB), also known as the interatrial bundle, myocardial strands connecting the right and left atrial walls and is considered to be the main pathway of interatrial conduction.
THE AV NODE The AV node is located in the posterior wall of the right atrium immediately behind the tricuspid valve.
Cause of Slow Conduction in the A-V Node
What is the significance of AV nodal delay?
The cardiac impulse does not travel from the atria to the ventricles too rapidly.
It is primarily the AV node and it’s adjacent fibers that delay this transmission into the ventricles
AV BUNDLE OR BUNDLE OF HIS
From the AV node arises a special conducting pathway .
RIGHT AND LEFT BUNDLE BRANCHES
FASCICLE
The right bundle branch contains one fascicle.
The left bundle branch into three fascicles:
The left anterior,
The left posterior, and
The left septal fascicle.
PURKINJE FIBRES
The LT and RT bundle branches divides in turn course sidewise around each ventricular chamber and back toward the base of heart.
The ends of Purkinje fibers penetrate about one third of the way into muscle mass and finally become continuous with cardiac muscle fibers
,abundant with glycogen and extensive gap junctions, rapidly transmit cardiac action potentials in 0.03sec
Cardiac muscle physiology
This document provides an overview of cardiac muscle structure and function. It defines key terms related to the properties of cardiac muscle such as rhythmicity, excitability, conductivity, and contractility. It describes the cardiac syncytium and normal conduction pathway in the heart. It explains excitation-contraction coupling in cardiac muscle and compares it to skeletal muscle. It also compares action potentials in the sinoatrial node and ventricular muscle. Finally, it discusses the significance of the plateau and refractory period in ventricular muscle action potentials.
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The document discusses the structure and function of the cardiac muscle and heart. It describes the heart chambers, valves, and blood flow through the heart. It explains that the heart pumps blood through contraction and relaxation in a cardiac cycle. It details the conducting system of the heart which generates and spreads the electrical impulse for heart contraction. This includes the sinoatrial node, atrioventricular node, bundle of His, and Purkinje fibers. It notes that cardiac muscle cells are striated like skeletal muscle but have specialized ion channels and gap junctions allowing rapid impulse transmission.
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cardiac conduction system.pptx
The cardiac conduction system generates and conducts electrical impulses throughout the heart to coordinate rhythmic contractions. It includes the sinoatrial node, which acts as the pacemaker, along with pathways that conduct impulses from the atria to the ventricles. The atrioventricular node introduces a delay between atrial and ventricular contractions. The bundle of His and Purkinje fibers then rapidly conduct impulses through the ventricles to allow for synchronized contraction. The system receives inputs from the autonomic nervous system that can alter heart rate.
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Heart
The heart is a hollow muscular organ located in the thoracic cavity between the lungs. It is composed of three layers: the outer pericardium, middle myocardium layer of muscle, and inner endocardium lining. The heart is further divided into four chambers - right and left atria on top which receive blood and right and left ventricles on bottom which pump blood out. It has a specialized conduction system including the sinoatrial node which initiates impulses and pacemaking, atrioventricular node which conducts impulses to ventricles, and Purkinje fibers which transmit the impulse through the ventricles to contract in a coordinated way. The heart is supplied by coronary arteries and drained
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The heart is a hollow muscular pump located in the chest cavity. It has four chambers - two upper atria and two lower ventricles. The heart is surrounded by the pericardium and has three layers - epicardium, myocardium, and endocardium. It receives deoxygenated blood from the body and pumps it to the lungs for oxygenation, then receives oxygenated blood from the lungs and pumps it out to the body. The heart has valves that ensure one-way blood flow and a specialized conduction system that generates electrical impulses to coordinate contractions.
CONDUCTIVE SYSTEM OF HEART .pptx BY MRS. WINCY THIRUMURUGAN .PROFESSOR.NURSIN...
MEANING.
The conducting system of the heart consists of cardiac muscle cells and conducting fibers (not nervous tissue) that are specialized for initiating impulses and conducting them rapidly through the heart.
It provides the heart its automatic rhythmic beat.
The purpose is to
Generating rhythmical electrical impulses to cause rhythmical contraction of the heart muscle. Conducting these impulses rapidly throughout the heart.
This pathway is made up of 5 elements:
The sino-atrial (SA) node.
The atrio-ventricular (AV) node.
The bundle of His.
The left and right bundle branches.
The Purkinje fibers.
SINOATRIAL NODE
The sinoatrial (SA) node is a collection of specialized cells (pacemaker cells), and is located in the upper wall of the right atrium, at the junction where the superior vena cava enters.
These pacemaker cells can spontaneously generate electrical impulses. The wave of excitation created by the SA node spreads via gap junctions across both atria, resulting in atrial contraction (atrial systole) – with blood moving from the atria into the ventricles.
The SA node is supraventricular and is sensitive to parasympathetic and sympathetic influence.
The SA node generates impulses and influenced by the Autonomic Nervous System:
Sympathetic nervous system – increases firing rate of the SA node, and thus increases heart rate.
Parasympathetic nervous system – decreases firing rate of the SA node, and thus decreases heart rate
THE INTER NODAL PATHWAYS consist of three bands (anterior, middle, and posterior) that lead directly from the SA node to the next node in the conduction system, the atrioventricular node. The impulse takes approximately 50 m s (milliseconds) to travel between these two nodes.
Bachmann's bundle (BB), also known as the interatrial bundle, myocardial strands connecting the right and left atrial walls and is considered to be the main pathway of interatrial conduction.
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Cause of Slow Conduction in the A-V Node
What is the significance of AV nodal delay?
The cardiac impulse does not travel from the atria to the ventricles too rapidly.
It is primarily the AV node and it’s adjacent fibers that delay this transmission into the ventricles
AV BUNDLE OR BUNDLE OF HIS
From the AV node arises a special conducting pathway .
RIGHT AND LEFT BUNDLE BRANCHES
FASCICLE
The right bundle branch contains one fascicle.
The left bundle branch into three fascicles:
The left anterior,
The left posterior, and
The left septal fascicle.
PURKINJE FIBRES
The LT and RT bundle branches divides in turn course sidewise around each ventricular chamber and back toward the base of heart.
The ends of Purkinje fibers penetrate about one third of the way into muscle mass and finally become continuous with cardiac muscle fibers
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This document provides an overview of cardiac muscle structure and function. It defines key terms related to the properties of cardiac muscle such as rhythmicity, excitability, conductivity, and contractility. It describes the cardiac syncytium and normal conduction pathway in the heart. It explains excitation-contraction coupling in cardiac muscle and compares it to skeletal muscle. It also compares action potentials in the sinoatrial node and ventricular muscle. Finally, it discusses the significance of the plateau and refractory period in ventricular muscle action potentials.
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The document discusses the structure and function of the cardiac muscle and heart. It describes the heart chambers, valves, and blood flow through the heart. It explains that the heart pumps blood through contraction and relaxation in a cardiac cycle. It details the conducting system of the heart which generates and spreads the electrical impulse for heart contraction. This includes the sinoatrial node, atrioventricular node, bundle of His, and Purkinje fibers. It notes that cardiac muscle cells are striated like skeletal muscle but have specialized ion channels and gap junctions allowing rapid impulse transmission.
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The cardiovascular system transports blood throughout the body via blood vessels and the heart. It consists of blood, blood vessels, and the heart. The heart is a muscular pump made of cardiac muscle that has specialized properties. It has four chambers and uses two circuits - pulmonary and systemic circulation - to oxygenate blood and transport nutrients and waste. The circulatory system evolved over time in vertebrates from a two-chambered heart in fish to the four-chambered heart in mammals.
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This document provides an overview of cardiac anatomy and physiology. It identifies the venous system of the heart including the coronary sinus. It describes the specialized conduction system including the sinoatrial node, atrioventricular node, His bundle, and Purkinje fibers. It lists the properties of cardiac cells and identifies the internal structures of the atria and ventricles. It also describes cardiac innervation and how the autonomic nervous system influences heart rate, conductivity and contractility. Key concepts covered include cardiac output, stroke volume, preload, afterload, and the Frank-Starling law of the heart.
cardiac conduction system.pptx
The cardiac conduction system generates and conducts electrical impulses throughout the heart to coordinate rhythmic contractions. It includes the sinoatrial node, which acts as the pacemaker, along with pathways that conduct impulses from the atria to the ventricles. The atrioventricular node introduces a delay between atrial and ventricular contractions. The bundle of His and Purkinje fibers then rapidly conduct impulses through the ventricles to allow for synchronized contraction. The system receives inputs from the autonomic nervous system that can alter heart rate.
Cardiac tamponade
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Spinal cord (2)
The spinal cord is the lower elongated part of the central nervous system that lies extra cranially within the vertebral canal. It extends from the foramen magnum to the lower border of L1 vertebra. The spinal cord has 31 pairs of spinal nerves that emerge from it and it is protected within the bony vertebral canal by the meninges. It receives its blood supply from the anterior and posterior spinal arteries as well as segmental medullary branches. Injuries and diseases of the spinal cord can result in various clinical manifestations depending on the location and severity of the lesion.
Heart
The heart is a hollow muscular organ located in the thoracic cavity between the lungs. It is composed of three layers: the outer pericardium, middle myocardium layer of muscle, and inner endocardium lining. The heart is further divided into four chambers - right and left atria on top which receive blood and right and left ventricles on bottom which pump blood out. It has a specialized conduction system including the sinoatrial node which initiates impulses and pacemaking, atrioventricular node which conducts impulses to ventricles, and Purkinje fibers which transmit the impulse through the ventricles to contract in a coordinated way. The heart is supplied by coronary arteries and drained
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CONDUCTIVE SYSTEM OF HEART .pptx BY MRS. WINCY THIRUMURUGAN .PROFESSOR.NURSIN...
CONDUCTIVE SYSTEM OF HEART .pptx BY MRS. WINCY THIRUMURUGAN .PROFESSOR.NURSIN...
Anatomy & physiology for the EP professional part II 8.4.14
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Our aim is to organise conscious gatherings and retreats for open and inquisitive minds and souls, with and without the assistance of sacred plants.
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The UK is currently facing a Adhd Medication Shortage Uk, which has left many patients and their families grappling with uncertainty and frustration. ADHD, or Attention Deficit Hyperactivity Disorder, is a chronic condition that requires consistent medication to manage effectively. This shortage has highlighted the critical role these medications play in the daily lives of those affected by ADHD. Contact : +1 (747) 209 – 3649 E-mail : sales@trinexpharmacy.com
Top-Vitamin-Supplement-Brands-in-India List
Swisschem Dermacare provides the Top 10 Vitamin Supplement Brands in India. To know more about us give us call at our official number
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Journal Article Review on Rasamanikya
Rasamanikya is a excellent preparation in the field of Rasashastra, it is used in various Kushtha Roga, Shwasa, Vicharchika, Bhagandara, Vatarakta, and Phiranga Roga. In this article Preparation& Comparative analytical profile for both Formulationon i.e Rasamanikya prepared by Kushmanda swarasa & Churnodhaka Shodita Haratala. The study aims to provide insights into the comparative efficacy and analytical aspects of these formulations for enhanced therapeutic outcomes.
Best Ayurvedic medicine for Gas and Indigestion
Here is the updated list of Top Best Ayurvedic medicine for Gas and Indigestion and those are Gas-O-Go Syp for Dyspepsia | Lavizyme Syrup for Acidity | Yumzyme Hepatoprotective Capsules etc
ABDOMINAL TRAUMA in pediatrics part one.
Abdominal trauma in pediatrics refers to injuries or damage to the abdominal organs in children. It can occur due to various causes such as falls, motor vehicle accidents, sports-related injuries, and physical abuse. Children are more vulnerable to abdominal trauma due to their unique anatomical and physiological characteristics. Signs and symptoms include abdominal pain, tenderness, distension, vomiting, and signs of shock. Diagnosis involves physical examination, imaging studies, and laboratory tests. Management depends on the severity and may involve conservative treatment or surgical intervention. Prevention is crucial in reducing the incidence of abdominal trauma in children.
A Classical Text Review on Basavarajeeyam
Basavarajeeyam is a Sreshta Sangraha grantha (Compiled book ), written by Neelkanta kotturu Basavaraja Virachita. It contains 25 Prakaranas, First 24 Chapters related to Rogas& 25th to Rasadravyas.
The Electrocardiogram - Physiologic Principles
These lecture slides, by Dr Sidra Arshad, offer a quick overview of the physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar lead (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
6. Describe the flow of current around the heart during the cardiac cycle
7. Discuss the placement and polarity of the leads of electrocardiograph
8. Describe the normal electrocardiograms recorded from the limb leads and explain the physiological basis of the different records that are obtained
9. Define mean electrical vector (axis) of the heart and give the normal range
10. Define the mean QRS vector
11. Describe the axes of leads (hexagonal reference system)
12. Comprehend the vectorial analysis of the normal ECG
13. Determine the mean electrical axis of the ventricular QRS and appreciate the mean axis deviation
14. Explain the concepts of current of injury, J point, and their significance
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. Chapter 3, Cardiology Explained, https://www.ncbi.nlm.nih.gov/books/NBK2214/
7. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Top 10 Best Ayurvedic Kidney Stone Syrups in India
we have mentioned the best 10 ayurvedic Kidney Stone Syrups. You can check all these products and choose the best one for yourself.
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Top 10 Best Ayurvedic Kidney Stone Syrups in India
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CONDUCTING SYSTEM OF HEART.pptx
- 1. CONDUCTING SYSTEM OF HEART Prepared by Mr . RAJEEV THIRUMAL .,M . Pharm. Assistant Professor, Dept of Pharamacology , Kasthooribha Gandhi Pharmacy College, Namakkal ,Tamil nadu .
- 2. LAYERS OF HEART • ENDOCARDIUM i. Endothelium ii. Sub-endocardial connective tissue • MYOCARDIUM • PERICARDIUM i. Serous a) Visceral serous pericardium (EPICARDIUM) b) Parietal serous pericardium ii. fibrous
- 3. TYPES OF MYOCARDIAL FIBERS 1) Contractile fibers a) Atrial muscle fibers b) Ventricular muscle fibers 2) Non – contractile fibers (modified cardiac muscle fibers) a) Specialized excitatory structure : SA node b) Specialized conductive structure: AV node, Bundle of HIS and Purkinje fibers.
- 4. SINO ATRIAL / SA NODE Pacemaker of mammalian heart • Small strip (1.5 cm length & 0.5 cm wide) of modified cardiac muscle. • Location: superior part of lateral wall of right atrium • Contains Pacemaker or P cells –generate impulse (70-80 impulses / min) • Continuous with atrial muscle fibers and intermodal fibers • Velocity of conduction of impulse is very slow (0.05 meter/sec)
- 5. ATRIOVENTRICULAR /AV NODE • Small diameter & multiple sub-branches fiber(2.2cm length,1cm width & 0.3 cm thickness) • Location: inferior part of medial wall of right atrium • Generate impulse (40-60 impulses / min) • Continuous with atrioventricular fibers • Velocity of conduction of impulse is very slow (0.05 meter/sec)
- 6. INTERNODAL FIBERS • Connect SA node and AV node 1) Anterior internodal fibers / tract of Bachman 2) Middle internodal fibers / tract of Wenckebach 3) Posterior internodal fibers / tract of Thorel • Location: wall of right atrium • Velocity of conduction of impulse is fast (1 meter/sec)
- 7. BUNDLE OF HIS • Small bundle of fibers (1cm length) • Location: middle part of atrioventricular septum (below the AV node) • At the level of interventricular septum divides into right and left bundle branch. • RBB longer & thinner, innervates right ventricle • LBB bifurcates into anterior &posterior , innervates left ventricle • Generate impulse • Continuous with purkinje fibers • Velocity of conduction of impulse is slow (0.12meter/sec)
- 8. PURKINJE FIBERS • Network of very small bundle of fibers • Purkinje cell - larger diameter & numerous gap junction (low impedance electrical synapse) • Location: sub-endocardial regions of right and left ventricles • Generate impulse (35-40 impulses / min) • Velocity of conduction of impulse is very fast ( 4 meters/sec)