Chap10_2401 - 1 MUSCULAR TISSUE Chapter 10 Anatomy and...

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1 MUSCULAR TISSUE Chapter 10 Anatomy and Physiology Lecture
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2 MUSCULAR SYSTEM *Bones and Joints form the framework of the body, but are not capable of moving the body by themselves. *Motion results from the contraction and relaxation of muscles . Muscle tissue is highly specialized to actively generate force and constitutes about 40 to 50 percent of total body weight. Myology - the scientific study of muscles. FUNCTIONS OF THE MUSCULAR SYSTEM 1. Body Movement 2. Maintenance of Posture 3. Respiration 4. Production of Body Heat 5. Communication 6. Constriction of Organs and Vessels 7. Heart Beat GENERAL FUNCTIONAL CHARACTERISTICS OF MUSCLE Muscle tissue is highly specialized to contract, or shorten, forcefully. Energy is extracted from molecules by process of metabolism. PROPERTIES OF MUSCLE : Muscle tissue has four major functional characteristics: 1. Contractility - Is the ability of muscle tissue to actively generate force to shorten and thicken to do work (contract) when a sufficient
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3 stimulus is received. Ability to shorten with a force. 2. Excitability - Is the ability of muscle tissue to receive and respond to stimuli. A stimulus is a change in the internal or external environment strong enough to initiate an impulse (action potential). Also respond to stimulation by nerve and hormones. 3. Extensibility - Is the ability of muscle tissue to be stretched (extend). Many skeletal muscles are arranged in opposing pairs. While one is contracting the other is relaxed and is undergoing extension. Biceps brachii and triceps brachii. 4. Elasticity - Is the ability of muscle tissue to return to its original shape after contraction or extension. TYPES OF MUSCLE TISSUE: (1) Skeletal, (2) Cardiac, and (3) Smooth. Are catergorized by location , histology (microscopic structure), and nervous and other modes of control . a. Skeletal muscle tissue - Is named for its location, is attached primarily to bones and moves parts of the skeleton. Characteristics : Striations, many nuclei located around the periphery of the fiber, unbranched fibers. (Are also attached to skin, other muscles, or deep fascia.) *Are striated - grooved, or furrowed on microscopic level. *Are voluntarily - can contract and relax by conscious control b. Cardiac Muscle Tissue - Forms the back of the wall of the heart.
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4 Characteristics : Striations, single nucleus, branched fibers with intercalated discs. *Are striated - grooved or furrowed on microscopic level. *Are Involuntarily - contraction not under conscious control. c. Smooth Muscle Tissue - Involved with processes related to maintaining the internal environment. Characteristics : No striations, single nucleus, and spindle-shaped fibers. -Located in the walls of hollow internal structures, such as blood vessels , the stomach , and the intestines . -Also found in the skin attached to hair follicles.
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This note was uploaded on 03/10/2012 for the course BIOL 2403 taught by Professor Campbell during the Spring '12 term at Texas Pan American.

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Chap10_2401 - 1 MUSCULAR TISSUE Chapter 10 Anatomy and...

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