chapter 8

muscular

Skeletal muscle

moves bones (voluntary)

Cardiac muscle

pumps blood (involuntary)

Smooth muscle

move materials through organs (involuntary)

Sarcomere

Basic functional unit of myofibril, region between two Z-lines

Sarcolemma function

cell membrane of muscle fiber

Sarcoplams

cytoplasm of muscle cell

Myofibrils

protein fibers responsible for muscle contraction

Myosin

Thick filament

Actin

Thin filament

Fascia

surrounds and separates muscles

Tendon

Attaches muscle to bone

Aponeurosis

Flat sheet like tendon

Epimysium

covers entire muscle

perimysium

cover fascicle

Endomysium

Covers one muscle fiber

skeletal muscle fiber definition

Muscle cell

sarcoplasmic reticulum

stores calcium

myofibrils

contracting structure

T tubules

carry signal inward

Cisternae

store and release calcium during contraction

motor neuron

send signal to muscle

synaptic vesicles

stores/release ACh

Synaptic cleft

gap between nerve and muscle

Motor end plate

receives ACh signal