ANP 1105 Lecture Notes - Lecture 3: Smooth Muscle Tissue, Skeletal Muscle, Cardiac Muscle

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Jackie Carnegie

Document Summary

Contraction depends on actin & myosin myo laments. Hypertrophy: cells get bigger, they do not divide. Locomotion, manipulation, blood ow & pressure, respiration, propelling of food. Maintenance of body temperature esp. skeletal muscle (40% body mass) Excitability/irritability ability to receive and respond to a stimulus stimulus: usually a chemical (nt/hormone/ph) response: ap along sarcolemma & muscle contraction. Contractility ability to shorten forcibly when adequately stimulated. Elasticity ability to resume resting length after being stretched. Anatomy of a skeletal muscle bre (muscle cell) Syncytium: many cells that have been brought together to make one. Very large (10-100 m in diameter, lengths in cm) Sarcoplasm: has lots of glycogen and myoglobin. T-tubules: present in cardiac and skeletal muscles, carry impulse into interior of muscle cell. Endomysium: wraps individual muscle bres, wispy areolar connective tissue. Perimysium and fascicles: groups of muscle bres (fascicle) wrapped by dense irregular tissue (perimysium) Epimysium: over coat of dense irregular connective tissue the surrounds entire muscle.