KINE 1020 Lecture Notes - Lecture 42: Skeletal Muscle, Smooth Muscle Tissue, Cardiac Muscle

• School: York University
• Department: Kinesiology & Health Science
• Course: KINE 1020
• Professor: Michael Riddell

Document Summary

A. skeletal muscle: striated (see anatomy of sarcomere", voluntary (exception is a reflex, 600 skeletal muscles. 40-50% of total body weight: functions. Muscles are parallel because the force will move in one direction, cans scale out the force) B. cardiac muscle i. interconnected (electrically coupled: involuntary. C. smooth muscle: non-striated (blood vessel tone, stomach, bladder, etc), involuntary. To increase blood pressure need to contract artery. To lower blood pressure need to relax smooth muscle (widen artery) Smooth muscle in arteries to regulate blood pressure and blood flow involuntary. Fibers merge strands of collagen(strong), that connects to bone. Composed of muscle fibers( therefore accumulating lots of cells) Contains actin and myosin bands that causes contraction. Covers are made out of connective tissue, but location changes name. Muscle - fascicule - fiber - fibril. Where you get the source of energy to power the shortening of this myofibril. If tore proteins, need to make more proteins( reason why there is multiple)