Muscle Anatomy Vocab

creatine

helps regenerate ATP, ________ phosphate

myosin

thick filaments of muscle fiber

skeletal

type of muscle that connects to bones, voluntary

vesicles

store neurotransmitters

acetylcholine

neurotransmitter used to cause muscle contraction

tendon

connects muscles to bones

myofibril

individual muscle fiber

mitochondria

organelle that provides the energy needed for muscle contraction

ligament

connects bones to other bones

perimysium

surrounds fascicles

actin

thin filaments of a muscle fiber

threshold

minimal level of stimulus to cause a contraction

sarcomere

section of a myofibril from one Z line to the next Z line

fascicle

bundle of muscle fibers

filament

theory that explains how muscle contraction works; sliding _________ theory

epimysium

outermost layer, surrounds entire muscle

sarcolemma

muscle fiber membrane

striated

describes muscles that are striped in appearance

cleft

space between a neuron and the muscle, synaptic ______

bands

overlapping patterns of actin and myosin; I and A _______

reticulum

membranous channels that surround the myofibrils; sarcoplasmic _______

fatigue

when muscles become tired

smooth

type of muscles found in the digestive tract, involuntary

cardiac

type of muscle that makes up the heart