KIN-10 Lecture Notes - Lecture 6: Alpha Motor Neuron, Glycolysis, Glycogen
Document Summary
Elasticity: return to original shape after force is removed. Non-contractile component: non-force producing; connective tissues important for muscle"s physiological and mechanical performance. Consists of individual muscle cells (muscle fibers) Muscle-fasciculi-muscle fiber-myofibril: hundreds to thousands per muscle fiber. Muscle produces force but does not change length. Isometric: muscle active while maintaining constant length. The physiological steps that produce a muscle contraction. Highest number of mitochondria, oxidative enzymes, myoglobin. Intermediate fibers, sharing characteristics of type i and type iix. Uses anaerobic glycolysis (metabolizes sugar without using oxygen) High glycogen and glycolytic enzyme content, myosin atpase activity. Determine which alpha motor neurons innervate fibers. Aging: muscles lose type ii motor units. Motor unit lower motor neuron (lmn) and all of the muscle fibers it innervates. Henneman"s size principle nervous system recruits muscle fibers in order, starting with the smallest most aerobic, and fatigue resistant motor units, followed by the larger, least aerobic, and easily fatigued motor unites. Type i type iia type iib.
