Structure and function of muscle tissue pdf

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structure and function of muscle tissue pdf

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Striated skeletal muscles have characteristic cross-striations which are due to the regular arrangement of contractile elements, the sarcomeres. Striated skeletal muscles contract in response to nerve impulses from the motor neurons of the central nervous system CNS or at the conscious level. They are related to skeletal segments. The striated cardiac muscle of the heart is called the myocardium.

Structure of Skeletal Muscle

Muscle Lab Learning Objectives Identify the histological landmarks of skeletal muscle Contrast the structure and function of skeletal, smooth, and cardiac muscle tissue. Identify morphological differences in smooth muscle across tissues. Explain the structure and function of the intercalated disc Identify the functional components of a neuromuscular junction. Identify some key pathological examples relevant to muscle histology. Keywords skeletal muscle muscle fiber fasicle endomysium perimysium epimysium sarcolemma sarcoplasmic reticulum motor unit neuromuscular junction acetylcholine myofibrils I-band A-band Z-line H-band M-line myofilament thick filament thin filament sarcomere T-tubule terminal cisternae slow-twitch muscle fiber myoglobin red fiber fast-twitch muscle fiber white fiber smooth muscle involuntary muscle adhesion density focal density cardiac muscle intercalated disc functional syncytium fascia adherens desmosomes gap junction Purkinje fiber.

Muscle tissue is a soft tissue that composes muscles in animal bodies, and gives rise to muscles' ability to contract. It is also referred to as myopropulsive tissue. This is opposed to other components or tissues in muscle such as tendons or perimysium. It is formed during embryonic development through a process known as myogenesis. This tissue is responsible for movements in our body.

What are the main functions of the muscular system?

The muscular system consists of various types of muscle that each play a crucial role in the function of the body. Muscles allow a person to move, speak, and chew. They control heartbeat, breathing, and digestion. Other seemingly unrelated functions, including temperature regulation and vision, also rely on the muscular system. The muscular system contains more than muscles that work together to enable the full functioning of the body. Skeletal muscles are the only muscles that can be consciously controlled. They are attached to bones, and contracting the muscles causes movement of those bones.

Organization and General Functions. Muscle is a principal tissue type, Specialized for contraction. Like neurons, muscle is an excitable tissue, in that it can conduct or transmit electrical impulses respond to stimuli. All muscle tissues have 4 characteristics in common:. Examples related to:. Heat is a byproduct of metabolism. During exercise, a large amount of heat is generated.

If your institution subscribes to this resource, and you don't have a MyAccess Profile, please contact your library's reference desk for information on how to gain access to this resource from off-campus. Please consult the latest official manual style if you have any questions regarding the format accuracy. Muscle tissue, the fourth basic tissue type with epithelia, connective tissues, and nervous tissue, is composed of cells that optimize the universal cell property of contractility. As in all cells, actin microfilaments and associated proteins generate the forces necessary for the muscle contraction, which drives movement within organ systems, of blood, and of the body as a whole. Essentially all muscle cells are of mesodermal origin and differentiate by a gradual process of cell lengthening with abundant synthesis of the myofibrillar proteins actin and myosin. Three types of muscle tissue can be distinguished on the basis of morphologic and functional characteristics Figure 10—1 , with the structure of each adapted to its physiologic role.


PDF | Skeletal muscle is one of the most dynamic and plastic tissues of the human fibers (also referred to as myofibers or muscle cells) and.


Cell Morphology and Function: The Specificities of Muscle Cells

All muscle cells share several properties: contractility, excitability, extensibility, and elasticity:. Maintenance of posture: Without much conscious control, our muscles generate a constant contractile force that allows us to maintain an erect or seated position, or posture. Respiration: Our muscular system automatically drives movement of air into and out of our body. Heat generation: Contraction of muscle tissue generates heat, which is essential for maintenance of temperature homeostasis.

A whole skeletal muscle is considered an organ of the muscular system. Each organ or muscle consists of skeletal muscle tissue , connective tissue , nerve tissue , and blood or vascular tissue. Skeletal muscles vary considerably in size, shape, and arrangement of fibers. They range from extremely tiny strands such as the stapedium muscle of the middle ear to large masses such as the muscles of the thigh. Some skeletal muscles are broad in shape and some narrow.

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Cell Morphology and Function: The Specificities of Muscle Cells

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