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