Please help with anatomy!?

Question

I need some help with these two: I pick best answer as soon as it's been posted for 4 hours!

Thanks in advance!


1. Which of the following statements is TRUE about motor units?

a.) Each muscle fiber contacts several motor neurons.
b.) When motor units are small, a muscle can produce very fine actions.
c.) With smaller motor units, the muscle action is coarse.
d.) None the above are true.

2. Which muscles have striated muscle fibers as their muscle tissue?

a.) Skeletal muscles, like the quadriceps femoris
b.) Integumentary muscles, like facial muscles that can change expressions
c.) Extraocular muscles that move the eyeball
d.) All of the above

Answer 1

1. Which of the following statements is TRUE about motor units?

Letter B is TRUE.

a.) Each muscle fiber contacts several motor neurons.FALSE-->(A motor neuron contacts several muscle fibers).

b.) When motor units are small, a muscle can produce very fine actions.CORRECT.-(The smaller the motor unit, the more REFINED the action of the muscle).

c.) With smaller motor units, the muscle action is coarse.FALSE-->(With smaller motor units, the muscle action is refined).
d.) None the above are true.

2. Which muscles have striated muscle fibers as their muscle tissue?

>>The answer is letter D.<<
Muscles that have striated muscle fibers as their muscle tissue include the following: Skeletal Muscles,Branchiomeric Muscles(associated with the jaws, pharynx, palate, and larynx),Extraocular Muscles,and the Integumentary Muscles.

Answer 2

1 B
2 D

Answer 3

1. Think D but not sure
2. D for sure... striated muscles are ones that can be voluntarily controlled.

Answer 4

1. D
2. A