four main functions of muscles

uses all three types

blood circulation

smooth muscle

food digestion

movement

locomotion, blood circulation, food digestion

four main functions

movement, maintenance of posture, heat production, joint stability

heat production

muscle contractions produce heat due to its inefficiency about 70% of all energy produced by muscles is heat

joint stability

muscle tone is the most important aspect, helps to stabilize articulations, guides and stabilizes movements of joints

posture maintenance

on-going skeletal muscle contractions of postural muscles. helps hold body in stationary positions.