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32 terms

Muscular System

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belly
describe the large fleshy portion of muscle (lies between point of attachment)
fascia
touch connective tissue, forms layers around muscle
epimysium
outer layer of fascia; extend either down and up muscle fiber to end points and attach to bone and form a tendon
perimysium
second layer; surrounds smaller bundles of muscle fibers (fascicles)
ligament
bone to bone
tendon
muscle to bone
endomysium
individual muscle fiber; third layer of connective tissue that surrounds the fascicles (in the perimysium)
mus
meaning little mouse; movements of muscle under skin looked like little mouse
types of muscles
skeletal, smooth & cardiac
compartment syndrome
"crush syndrome"; when compartment is deprived of oxygen and nourishment, the muscle and nerves begin to die
aponeurosis
flat, sheetlike fascia, connects muscle to muscle or muscle to bone; third type of connection
Which of the following "slides" in the sliding filament hypothesis?
actin and myosin
Which of the following is not true of a somatic motor neuron?
It is located within each sarcomere
The somatic motor nerve that supplies the muscles of the thigh has been severed. The person.
cannot walk
Which of the following causes the force-generating crossbridges?
the binding of the myosin head to actin
Compartment syndrome is serious because it
deprives the muscle of oxygen.
The biceps brachii, brachioradialis, and brachialis muscles
flex the forearm at the elbow
As the electrical signal travels through the T tubules, it causes the
release of calcium from the sarcoplasmic reticulum
Contraction of the right sternocleidomastoid muscle
rotates the head to the left.
Which of the following is not true of the chewing muscles?
They cannot tetanize.
Creatine phosphate
is an energy source for muscle contraction
Which of the following is least related to actin and myosin?
found in skeletal muscle, but not in smooth and cardiac muscle
Which of the following is not an event that occurs within the neuromuscular junction?
release of calcium from the sarcoplasmic reticulum
List the three types of muscles.
Skeletal smooth and cardiac
Which of the following is true of myasthenia gravis?
characterized by skeletal muscle weakness
When the muscle burns glucose anaerobically
lactic acid accumulates.
Which type of muscle requires stimulation by a somatic motor neuron?
skeletal muscle
Recruitment
increases the force of muscle contraction
twitch
single muscle responds to stimulus, the muscle contracts and then fully relaxes. not useful physiologically
tetanus
muscle is stimulated repeatedly, muscle has no time to relax and remains contracted. sustained muscle contraction
basis for naming muscles
determined by size, shape, direction of fibers, location, number of origins, origin and insertion, and muscle action
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