Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
45 Cards in this Set
- Front
- Back
epimysium
|
connective tissue sheath that surrounds each skeletal muscle
|
|
muscle fasciculus
|
muscle bundle
|
|
perimysium
|
connective tissue that surrounds muscle fasciculi
|
|
muscle fiber
|
single muscle cell; makes up muscle fasciculi
|
|
endomysium
|
connective tissue that surrounds a muscle fiber
|
|
myofibril
|
thread-like structure that extends from one end of the muscle fiber to the other
|
|
actin myofilament
|
thin myofilament which resembles two minute strands of pearls twisted together
|
|
troponin
|
provide calcium binding sites on actin myofilaments
|
|
tropomyosin
|
covers and uncovers attachment sites for myosin on actin myofilaments
|
|
myosin myofilament
|
thick myofilamnets which resemble bundles of golf clubs
|
|
contractility
|
ability to shorten with a force
|
|
excitability
|
the capacity to respond to a stimulus
|
|
extensibility
|
ability to be stretched
|
|
elasticity
|
ability to recoil to original resting length after being stretched
|
|
sarcomere
|
the basic structural and functional unit of the muscle
|
|
z disk
|
forms an attachment site for actin myofilaments; the end of the sarcomere
|
|
i band
|
part of a myofibril that contains only actin myofilaments
|
|
a band
|
part of a myofibril where actin and myosin myofilaments overlap
|
|
h zone
|
part of a myofibril that contains only myosin myofilaments
|
|
m line
|
anchors the myosin myofibrils in the center of the sarcomere
|
|
sarcoplasm
|
the cytoplasm of a muscle fiber
|
|
sarcolemma
|
the cell membrane of a muscle fiber
|
|
t tubules
|
invaginations of the sarcolemma that wrap around sarcomeres
|
|
sarcoplasmic reticulum
|
highly organized, smooth endoplasmic reticulum; contains high concentrations of calcium
|
|
t tubules
|
connect the sarcolemma and the sarcoplasmic reticulum
|
|
motor neuron
|
nerve cell that carries action potentials to skeletal muscle fibers
|
|
neuromuscular junction
|
point where the axon of a motor neuron joins with a skeletal muscle fiber; an example of synapse
|
|
motor unit
|
motor neuron and all the skeletal muscle fibers it supplies
|
|
synaptic cleft
|
space between the presynaptic terminal and the muscle fiber membrane
|
|
acetycholine
|
neurotransmitter released from synaptic vesicles of the presynaptic terminal
|
|
acetycholinesterase
|
enzyme that breaks down acetycholine
|
|
creatine phosphate
|
molecule used to store energy; used to quickly produce ATP
|
|
isometric
|
the length of the muscle does not change, but the amount of tension increases during the contraction process
|
|
isotonic
|
the amount of tension produced by the muscle is constant, but the length decreases
|
|
eccentric
|
isotonic contractions in which tension is maintained, but the opposing resistance causes the muscle to lengthen
|
|
concentric
|
isotonic contractions in which muscle tension increases as the muscle shortens
|
|
tendon
|
general term for the attachment of a muscle to a bone
|
|
aponeurosis
|
a broad, sheetlike tendon
|
|
origin
|
the most stationary end of a muscle; the head
|
|
insertion
|
end of the muscle attached to the bone undergoing the greatest movement
|
|
belly
|
part of the muscle between the origin and insertion
|
|
synergists
|
muscles that work together to accomplish a movement
|
|
antagonist
|
muscle working in opposition to another muscle
|
|
prime mover
|
muscle that plays the major role in accomplishing a particular movement
|
|
fixator
|
muscle that holds a bone in place
|