Innervates the liver, heart and genitals.

Once muscle spindles are activated in the stretch reflex, what type of input does the receptor provide to the control center?

Muscle fibers remain relaxed if there are few calcium ions in the sarcoplasm.

What helps us regulate our internal environment-

Some neurotransmitters (NT) can act like hormones.

Which is an example of positive feedback-

Which system(s) cause(s) the pupils to constrict (get smaller)?

Responsible for head and eye movement in response to visual stimuli

All cranial nerves are a mix of sensory and motor roots.

This is a contralateral, polysynaptic reflex important in maintaining balance.