Your friend nods back and forth to you, making the "yes" motion. What muscles are involved in this ‘yes’ motion? Select all that apply.

Your friend nods back and forth to you, making the "yes" motion. What muscles are involved in this 'yes' motion? Select all that apply.

a) bilaterally sternocleidomastoid

b) unilaterally sternocleidomastoid

c) bilaterally semispinalis capitis

d) unilaterally semispinalis capitis

e) bilaterally splenius capitis

f) unilaterally splenius capitis

g) bilaterally longissimus capitis

h) unilaterally longissimus capitis

i) spinalis capitis

a) bilaterally sternocleidomastoid

c) bilaterally semispinalis capitis

e) bilaterally splenius capitis

g) bilaterally longissimus capitis

i) spinalis capitis

Explanation:

There are different muscles involved in 5he motion of nodding the head to make a "yes" motion and the neck is a major part of the body that is involved in the movement.

The muscles involved in the movement specifically are a) bilaterally sternocleidomastoid

c) bilaterally semispinalis capitis

e) bilaterally splenius capitis

g) bilaterally longissimus capitis

i) spinalis capitis

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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