Lab 19
sarcolemma
cell membrane of a muscle fiber
myosin
protein found within thick filament
fascicle
small bundle of muscle fibers within a muscle
sarcoplasmic reticulum
cellular organelle in muscle fiber corresponding to the endoplasmic reticulum
fascia
connective tissue located between adjacent muscles
biceps brachii
contracts when forearm is flexed at the elbow
synergists
assisting muscles of an agonist
origin
attached to a fixed location
tendon
cordlike part that attaches a muscle to a bone
epimysium
layer of connective tissue that surrounds a skeletal muscle
sarcomere
unit of alternating light and dark striations between Z lines
insertion
usually attached to a more movable location
transverse (T) tubule
membranous channel extending inward from muscle fiber membrane
triceps brachii
act as an agonist when forearm is extended at the elbow
prime mover
an agonist that provides the most force of a specific action is sometimes referred to as
sarcoplasm
cytoplasm of a muscle fiber
perimysium
layer of connective tissue that separates a muscle into small bundles of fascicles
endomysium
layer of connective tissue that surrounds an individual muscle fiber
agonist
muscle responsible for an action
antagonist
muscle that resists the actions of agonist and cause movement in the opposite direction
