The human heart is a muscular organ about the size of a fist that acts as a pump. It has four chambers and is located in the chest cavity between the lungs. The heart receives deoxygenated blood from the body and pumps it to the lungs, where it picks up oxygen and is then pumped back out to the rest of the body through arteries. The heart's rhythm is controlled by electrical impulses originating from specialized cardiac muscle tissue, and each heartbeat involves the coordinated contraction and relaxation of the heart's chambers in a cycle that repeats approximately once every 0.8 seconds to circulate blood throughout the body.
Heart is the center of your cardiovascular system. It is responsible for pumping blood through your body, carrying nutrients in and taking waste out. Having good cardiovascular health is an important factor of optimal wellness.
An adult has a mass of 250-350 grams.
Each day, the average heart beats 100,000 times, pumping about 2,000 gallons (7,571 liters) of blood.
By the end of a long life, a person's heart may have beat (expanded and contracted) more than 3.5 billion times.
By the end of a long life, a person's heart may have beat (expanded and contracted) more than 3.5 billion times.
Heart has four chambers and four valves present in the heart control the flow of blood in the heart.
Heart is the center of your cardiovascular system. It is responsible for pumping blood through your body, carrying nutrients in and taking waste out. Having good cardiovascular health is an important factor of optimal wellness.
An adult has a mass of 250-350 grams.
Each day, the average heart beats 100,000 times, pumping about 2,000 gallons (7,571 liters) of blood.
By the end of a long life, a person's heart may have beat (expanded and contracted) more than 3.5 billion times.
By the end of a long life, a person's heart may have beat (expanded and contracted) more than 3.5 billion times.
Heart has four chambers and four valves present in the heart control the flow of blood in the heart.
The circulatory system, also called the cardiovascular system or the vascular system, is an organ system that permits blood to circulate and transport nutrients (such as amino acids and electrolytes), oxygen, carbon dioxide, hormones, and blood cells to and from the cells in the body to provide nourishment and help in fighting diseases, stabilize temperature and pH, and maintain homeostasis.
Welcome to "Anatomy of the Heart," an enlightening presentation that takes you on a captivating journey through the intricate structure of the human heart.
Location and orientation with the thorax
Structure of the heart
Structure of the Heart Wall
Chambers of the Heart
Valves of the Heart
Pathway of blood through the heart
Cardiac Muscle Tissue
Conducting System and Innervation
Four Steps of Cardiac Conduction
Blood Supply to the Heart
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
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6. THE HUMAN HEART
The heart is a muscular organ, which act as a pump.
It is about size of your fist.
It lies the chest cavity between the lungs with its
lower end tilted a bit of the left.
The heart has four chambers- right atrium, left
atrium, right ventricle, and left ventricle.
The heart is divided into two halves by a thick wall.
7. This wall prevent oxygenated blood from mixing
with deoxygenated blood.
Deoxygenated blood carrying carbon dioxide from
all parts of the body enters the right side through two
major veins (superior & inferior vena cava).
The heart pumps in to two arteries, which carry it to
the lungs.
In the lungs, the blood gives up carbon dioxide and
picks up oxygen.
8. The oxygenated blood, blood carrying oxygen then
enters the left side of the heart which pump it in to
the artery.
Branches of this artery carry the oxygenated blood
to the rest of the portions.
9. Automatic Rhythm of Heart
Heart beat is the result from a wave of electrical
potential called the cardiac impulse.
Human heart is myogenic.
The heart beat is originated from a specialized cardiac
muscle fibres called nodal tissue.
The nodal tissue formed of two contraction centres
and a conducting system of fibrils.
The contraction centres include SA node and AV node.
10. HEART BEAT
• The function of heart is to pump blood to various parts
of the body.
This is brought about by the relaxation and
contraction of its chambers.
Contraction of the chambers of the heart is known as
systole and their relaxation is known as diastole.
A contraction and subsequent relaxation constitute a
heartbeat.
11. CARDIAC CYCLE
The relaxation of all the four chambers of the heart is
known as joint diastole.
The sequential events which occur from the beginning
of one heart beat to the beginning of the next is known
as cardiac cycle.
It consists of systole and diastole of both atria and
ventricles.
The duration of cardiac cycle is 0.8 seconds.
The heart beat once in 0.8 seconds.
