Lec16 - The skeleton .CAN move but only with THIS system....

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Unformatted text preview: The skeleton .CAN move but only with THIS system. MUSCULAR 600 Human skeletal muscles General structural and functional topics muscle shape and function connective tissues of muscle coordinated actions of muscle groups intrinsic and extrinsic muscles muscle innervation Regional descriptions Organization of Muscles Muscles. Provide the power for movement Basic Physiological Properties 1. Contractility 2. Excitability 3. Extensibility 4. Elasticity These four properties are all involved in Movement Excitability (Contractability) to chemical signals, stretch and electrical changes across the plasma membran Contractility -- shortens when stimulated Extensibility -- capable of being stretched Elasticity -- returns to its original resting length after being stretched Characteristics of Muscle Muscle cells are elongated (muscle cell = muscle fiber) Contraction of muscles is due to the movement of microfilaments All muscles share some terminology Prefix myo refers to muscle Prefix mys refers to muscle Prefix sarco refers to flesh Characteristics of Muscles The myocyte is elongated Their characteristics depend on which type of muscle they are found: skeletal, muscle or cardiac. Muscle Cell =Muscle Fiber= Myocyte Th e Ce ll: 1. Muscle Fiber: A muscle fiber is a single cell 2. Sarcolemma: Muscle cell membrane 3. Sarcoplasm: Muscle cell cytoplasm a. Many small oval nuclei b. Many mitochondria c. Sarcoplasmic reticulum d. Transverse tubules e. Myofibrils 3 Typ e s .. 1 . Skeletal Muscle : 2. Cardiac Muscle : 3. Smooth Muscle : 1. Skeletal Muscle: Voluntary movement Maintenance of posture Heat production 2. Cardiac Muscle: Rhythmic "synchronized" beat Involuntary - regulatable by A.N.S. 3. Smooth Muscle: Involuntary peristaltic contractions of digestive tract Vasoconstriction and vasodilation of blood vessels Muscle functions: Specialized to contract, to pull on body parts 1. Cause movement 2. Resist motion (Stability) 3. Movement of body fluids - blood, urine 4. Movement of food through gut 5. Heat production: Produces up to 85% of our body heat vital to functioning of enzymes and thus all metabolism....
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This note was uploaded on 12/08/2011 for the course AMY 2A taught by Professor Jamesivey during the Spring '06 term at Riverside Community College.

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Lec16 - The skeleton .CAN move but only with THIS system....

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