The part of the nervous system that controls voluntary activities is the

• central nervous system.

• autonomic nervous system.

• somatic nervous system.

• peripheral nervous system.

Which of the following is NOT a part of the peripheral nervous system?

• the somatic nervous system

• the autonomic nervous system

• nerves branching out from spinal cord

• the brain

The ________ insulates and protects the axon for some neurons.

• axon terminal

• myelin sheath

• cell body

• nucleus

Also called motor neurons, the ________ send signals from the brain to the glands and muscles.

• efferent neurons

• afferent neurons

• interneurons

• neurotransmitters

Which of the following is NOT a neurotransmitter?

• interneuron

• dopamine

• norepinephrine

• acetylcholine

Nerves branching out from the spinal cord are part of the

• synapse

• central nervous system

• neurons

• peripheral nervous system

Chemicals released by neurons, which determine the rate at which other neurons fire, are called

• synapse

• central nervous system

• neurons

• neurotransmitters

The brain and spinal cord are part of the

• synapse

• central nervous system

• neurons

• peripheral nervous system

The gap that exists between individual nerve cells is known as the

• synapse

• central nervous system

• neurons

• neurotransmitters

Long, thin cells of nerve tissue along which messages travel to and from the brain are called

• synapse

• central nervous system

• neurons

• neurotransmitters