This document summarizes muscle physiology, including:
1. The functions of muscle tissue such as movement, stability, and respiration.
2. The properties of muscle tissue including excitability, conductivity, contractility, extensibility, and elasticity.
3. The types and classifications of muscles as well as the roles of agonist and antagonist muscles.
4. Key aspects of muscle anatomy and the sliding filament mechanism of muscle contraction.
Skeletal muscle is one of the three significant muscle tissues in the human body. Each skeletal muscle consists of thousands of muscle fibers wrapped together by connective tissue sheaths. The individual bundles of muscle fibers in a skeletal muscle are known as fasciculi.
Muscle is one of the four primary tissue types of the body, and the body contains three types of muscle tissue: skeletal muscle, cardiac muscle, and smooth muscle.
Describes the overview of the skeletal muscles, its description, functons, and properties. It also inccludes the gross organization of the skeletal system.
The muscle are biological motors which convert chemical energy into force and mechanical work.
This biological machinery is composed of proteins – which is actomyosin and the fuel is ATP.
With the use of muscles we are able to act on our environment.
Skeletal muscle is one of the three significant muscle tissues in the human body. Each skeletal muscle consists of thousands of muscle fibers wrapped together by connective tissue sheaths. The individual bundles of muscle fibers in a skeletal muscle are known as fasciculi.
Muscle is one of the four primary tissue types of the body, and the body contains three types of muscle tissue: skeletal muscle, cardiac muscle, and smooth muscle.
Describes the overview of the skeletal muscles, its description, functons, and properties. It also inccludes the gross organization of the skeletal system.
The muscle are biological motors which convert chemical energy into force and mechanical work.
This biological machinery is composed of proteins – which is actomyosin and the fuel is ATP.
With the use of muscles we are able to act on our environment.
A complete lecture of the Histology of Muscle Tissues, taught at First Moscow State Medical University, Moscow, in the Histology department, for the first year English medium foreign medical students.
It includes the basic anatomy physiology of skeletal muscles, the thorough working of the muscles, at superficial level to molecular level, the energy input, smooth muscle-cardiac-skeletal muscles differences, smooth muscle anatomy physiology.
In this powerpoint, i have mentioned all the information with diagrams and functions in a very easy way. I am always there to solve any of the queries. Thank you.
The muscular system is composed of specialized cells called muscle fibres. Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction.
Histology and physiology of muscle contraction
It explains the basic structure of muscles and how muscle works for contraction.
In this, Disorders of muscles are also mentioned.
Structure of muscle: A whole skeletal muscle is considered an organ of the muscular system. A muscle uses ATP to contract and shorten, producing a force on the objects it is connected to.
A muscle consists of many muscle tissues bundled together and surrounded by Epimysium, a tough connective tissue similar to cartilage.
The epimysium surrounds bundles of nerve cells that run in long fibers, called Fascicles.
These fascicles are surrounded by their own protective layer, the Perimysium. This layer allows nerves and blood to flow to the individual fibers. Each fiber is then wrapped in an Endomysium, another protective layer.
These layers and bundles allow different parts of a muscle to contract differently.
The protective layer surrounding each bundle allows the different bundles to slide past one another as they contract.
Properties of muscle contraction:
Excitability • the ability to receive and respond to stimuli.
Conductivity • The ability to receive a stimulus and transmit a wave of excitation (electrochemical activity)
Contractility • the ability to shorten forcibly when stimulated.
Extensibility • the ability to be stretched or extended.
Elasticity • The ability to bounce back to original length
Whether it is the largest muscle in your body or the tiny muscle, every muscle functions in a similar manner.
A signal is sent from the brain along a bundle of nerves. The electronic and chemical message is passed quickly from a nerve cell to other nerve cell and finally arrives at the motor end plate/ Neuromuscular junction.
This signal causes the myosin proteins to grab onto the actin filaments around them.
Myosin uses ATP as an energy source to crawl along the green filament, actin.
Many small heads of the myosin fibers crawling along the actin filaments effectively shortens the length of each muscle cell.
The cells, which are connected end-to-end in a long fibers, contract at the same time and shorten the whole fiber.
Here are the several disease related to muscles such as
myasthenia gravis, muscular dystrophy, atrophy, etc.
Reflex activity is the response to a peripheral stimulation that occurs without our consciousness.
Is an involuntary response to a stimulus.
It is a type of protective mechanism.
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2. Contents… Introduction Functions of muscle tissue Properties of muscle tissue Types of muscles Agonist and antagonist Anatomy of skeletal muscle Neuromuscular junction Sliding Filament Mechanism of Muscle Contraction Tone of the Muscle Stretch Reflex Golgi Tendon Questions Bibliography
3. Latin- Musculus (Mouse) Muscle is a contractile tissue It contains contractile filaments that move past each other and change the size of the cell Introduction…
4. Movement Stability Thermogenesis Body movement Respiration Constriction of organs and vessels Heart beat Functions of Muscle Tissue
5. Excitability capable of response to chemical signals, stretch or other signals & responding with electrical changes across the plasma membrane Conductivity local electrical change triggers a wave of excitation that travels along the muscle fiber Contractility -- shortens when stimulated Extensibility -- capable of being stretched Elasticity -- returns to its original resting length after being stretched Properties of Muscle tissue
33. Intrafusal muscle fibersare skeletal muscle fibres that comprise the muscle spindle and are innervated by gamma motor neurons. These fibers are proprioceptors that detect the amount and rate of change of length in a muscle. These fibers are walled off from the rest of the muscle by a collagen sheath. This sheath has a spindle or "fusiform" shape, hence the name "intrafusal." Intrafusal Muscle Fibre
34. Extrafusal muscle fiber is a term given to standard muscle fibers as to distinguish them from intrafusal muscle fibers. Extrafusal muscle fibers are innervated by alpha motor neuron and generate tension by contracting, thereby allowing for skeletal movement. Extrafusal Muscle Fibers
35. motor neuron supply intrafusal fibers When a muscle is stretched stretch receptors in the intrafusal fibres are stimulated Impulse is transmitted to the spinal cord motor neuron is stimulated muscle is contracted Stretch Reflex
37. Sensory receptor that inhibits tension development in a muscle and initiates tension development in the antagonist muscles KEY: sense tension stimulated by the presence of active tension in a muscle Golgi Tendon Organ
38. Inhibits muscle tension in the muscle generating too much force and initiates development of muscle tension in the antagonist muscle (excites) Golgi Tendon Organ- Action