ANP 1105 Lecture Notes - Lecture 5: Myocyte, Smooth Muscle Tissue, Muscle Contraction

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Joanne Savory

Document Summary

Dr. joanne savory and dr. m zeroual: physiology of muscle tissue (ch 9 - musucles) Elongated cells = muscle fibers; in skeletal and smooth muscle. Prefixes myo/mys- (muscle) or sacro- (flesh) refers to muscle; i. e plasma membrane of muscle cells are sarcolemma. Muscle contraction depends on actin and myosin myofilaments. Excitability (irritability/responsiveness): ability to receive and respond to a stimulus: stimulus usually a chemical (nt, hormone, ph, response generate (ap) to travel along sarcolemma to make muscle contraction. Contractibility ability to shorten forcibly when adequately stimulated. Extensibility ability to be stretched or extended. Elasticity ability to resume resting length after being stretched. Generate movement: locomotion, manipulation, blood flow and pressure, respiration, propelling of food, urine, etc. Maintain posture and body position: constantly working against gravity. Joint stabilization: in shoulders, knees when moving parts of skeleton. Generation of heat: maintain body temperature (especially skeletal muscle = 40% of body mass)