ANP 1105 Lecture Notes - Lecture 9: Troponin, Motor System, The Motor

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: William Staines

Document Summary

Cardiac muscle: only in the heart, striated in voluntary, pacemaker sets rate of contraction; neural input can increase rate (do not require neuromuscular junction to generate contractions) Skeletal muscle: attach to and cover boney skeleton, longest muscle fibers, striated, voluntary, can contract rapidly; tires easily and must rest, strong and adaptable. Smooth muscle: walls of hollow, visceral organs, nonstriated, involuntary, slow, sustained contractions. Exercises slow sustain contractions and it is very important for peristalsis where it macerates food and carries nutrients. Muscle functions: generate movement: locomotion, manipulation, blood flow & pressure, respiration, propelling of food, urine, etc. , 2. Maintain posture: constantly working against gravity: 3. Joint stabilization: eg: shoulders, knees when moving parts of skeleton: 4. Generation of heat: maintenance of body temperature esp: skeletal muscle (at least. Ability to resume resting length after being stretched . Long cylindrical cell with many oval nuclei. Sarcoplasm contains lots of glycogen and myoglobin (lots of myofibrils, extensive sarcoplasmic reticulum; t-tubules)