Structure and function of muscle tissue pdf

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structure and function of muscle tissue pdf

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A whole skeletal muscle is considered an organ of the muscular system.

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.

Cell Morphology and Function: The Specificities of Muscle Cells

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. Muscles contain special proteins called contractile protein which contract and relax to cause movement.

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.

What are the main functions of the muscular system?

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. Pre-Lab Reading Introduction Muscles are multicellular contractile units.

Cell Morphology and Function: The Specificities of Muscle Cells

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.

Types of muscle tissue

Structure of Skeletal Muscle

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:.

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. For instance, if our core body temperature falls, we shiver to generate more heat. Communication: Muscle tissue allows us to talk, gesture, write, and convey our emotional state by doing such things as smiling or frowning.

 Ищите.  - Над ними склонился Фонтейн.  - Посмотрим, что у них. Соши начала просматривать документ. Ей попалось описание нитрата мочевины, в десять раз более мощной взрывчатки, чем динамит. Инструкция по ее изготовлению была проста, как рецепт приготовления жженого сахара. - Плутоний и уран, - повторял Джабба.



Он вот-вот задавит. Уже теряя сознание, она рванулась к свету, который пробивался из приоткрытой двери гостиничного номера, и успела увидеть руку, сжимающую пистолет с глушителем. Яркая вспышка - и все поглотила черная бездна. ГЛАВА 40 Стоя у двери Третьего узла, Чатрукьян с безумным видом отчаянно пытался убедить Хейла в том, что с ТРАНСТЕКСТОМ стряслась беда. Сьюзан пробежала мимо них с одной только мыслью - как можно скорее предупредить Стратмора.

What are the main functions of the muscular system?

А не заберет ли он ключ. Фонтейну нужно было какое-то прикрытие - на всякий случай, - и он принял необходимые меры. ГЛАВА 113 - Ни в коем случае! - крикнул мужчина с короткой стрижкой, глядя в камеру.