Kinesiology 4430F/G Lecture Notes - Alpha Motor Neuron, Cardiac Muscle, Muscle Tissue

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 4430F/G
• Professor: Greg Marsh

Document Summary

Skeletal muscle: a highly organized tissue(collection of similar cells) with a unique set of properties; 40% of body mass, connective tissue surrounding entire muscle, at all levels. Limb muscles have functional compartments(different functions for different parts, different conditions) Important for movement, providing heat energy to warm body(thermogenesis); protect organs, storage of proteins(metabolism: major function: transform electrochemical energy to mechanical energy to generate force(tension) by contraction, and ultimately to produce movement. 1 - excitability, irritable developing and propagating a transient electrical event(action potential) 4 - elasticity returns to original state after b and c. Graph strong correlation between volume and torque, men generate more force. Determinants of muscle force output: more size = more force; muscle force is proportional to cross-sectional area(csa); more correctly physiologic cross-sectional area(pcsa, shape=compartments, length of fibres, and pinnation(angle) arrangement. 2kg/cm2: graph- other factors exist which skew the results and prevents perfect relationship, tendon properties change via age health, etc.