Kinesiology 2230A/B Lecture Notes - Lecture 1: Dystrophin, Endomysium, Perimysium

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2230A/B
• Professor: Glen Belfry

Document Summary

Muscle: opposing pairs (ex. flexion/extension, agonist/antagonist) o. For every movement of a joint, need an opposite muscle to bring it back to its anatomical/resting position. Voluntary muscle; controlled consciously; has specific origin and insertion. Faster contraction/relaxation times aerobically/oxidatively (with o2); you are producing more force. Iib fibers are found in animals - have no oxidative capacity. Iix fibers found in humans - have a little oxidative capacity. Few mitochondria = little atp production through aerobic metabolism. Fastest contracting fibres- large in cross sectional area. Recruitment of fibers is related to the force that is required i. e. walking recruits st (light force) and running recruits ft (greater force) Controls itself with assistance from the cns and endocrine systems (adrenal gland: nor epinephrine and epinephrine: will affect hr and contractility, can depolarize spontaneously- sa node. Found in the walls of blood vessels and internal organs (ex. stomach, small intestine: vasoconstriction and vasodilation- surrounds the vasculature.