Muscle Contraction
What filament moves to make a muscle contract?
thin filaments
what is a prime mover?
the muscle that does most of the work in the movement
What kind of muscle tissue is involuntary and not striated?
smooth muscle
what does the endomysium cover?
muscle cells
Is a function of muscles to help generate heat?
Yes
Do you need a nerve impulse to contract a muscle?
yes
what does a synergist do?
helps/assists the prime mover
what are thick and thin filaments made of?
thick: myosin
thin: actin
What is a fascicle?
a bundle of muscle fibers
What is the synaptic cleft?
the space between the nerve and muscle
What does calcium do in muscle contraction?
allows the myosin to bind to the actin
What kind of muscle opposes the prime mover?
antagonist
What does the sarcoplasmic reticulum do?
stores calcium
what connective tissue surrounds a fascicle?
perimysium
What is a motor unit?
a nerve and all the muscle fibers it controls
What is acetylcholine?
neurotransmitter that signals muscles to contract
what type of muscle contraction does not actually shorten the muscle fibers?
isometric contraction
What is a sarcomere?
contractile unit in a muscle cell
What is the connective tissue that surrounds the entire muscle called?
epimysium
Does the origin or the insertion attach to the moveable bone?
insertion
What causes muscle fatigue?
oxygen debt
What do adduction and abduction mean
adduction: bringing towards the midline of body
abduction: moving away from the midline of the body
What makes skeletal muscle appear striated?
the appearance of the actin and myosin
What kinds of muscle tissue are striated?
skeletal and cardiac
What are the 7 ways to name a muscle?
Direction of fibers, location, relative size, number of origins, action, shape, location of origin and insertion