Anatomy & Physiology - CH9A NS #1

Muscle Structure

contraction

shortening and thickening

relaxation

back to resting state

muscle makes up to ___ of the total body weight

40-50%

strength

what comes from the conversion of chemical energy (ATP) into mechanical energy to generate force, perform work, and produce movement?

functions of muscle tissue

motion, stabilize body position, movement within the body and regulation organ volume

thermogenesis

maintains normal body temperaturesh

shivering

involuntary action that can increase thermogenesis by several hundred percents

skeletal muscle

attached primarily to bones and moves skeletal parts

striated

visible alternating light and dark bands of the fibers

voluntary

muscle tissue is under your conscious control

cardiac muscle

forms majority of the heart

involuntary

out of your control, conscious or unconscious

autorhythmicity

pacemaker system that causes heart to beat

smooth muscle

found in the walls of hollow internal structures

excitability

ability to respond to stimulus internal or external, by producing electrical signals

neurotransmitter

chemical released by neurons

hormone

chemical distributed by the bloodstream

contractility

ability to shorten and thicken

extensibility

the ability to be stretched without damage to the tissue

elasticity

ability of a muscle fiber to recoil and resume its resting length after being stretched