Peripheral Nervous System

In humans, the nervous system is initial divided into the _____ and _____ nervous systems.

• 1. afferent; efferent

• 1. sympathetic; parasympathetic

• 1. somatic; autonomic

• 1. central; peripheral

Which part of the neuron is involved in sending an impulse to the synapse area or to an effector?

• axon

• soma

• dendrite

Ion channels that are always open is called

• active

• leak

• gated

• local

Which of the following portions of the nervous system are involved in controlling the activities of glands?

• somatic

• central

• autonomic

The following ion(s) is/are involved in the neuronal action potential:

• Sodium (Na⁺)

• Potassium (K⁺)

• Calcium (Ca²⁺)

• Chloride (Cl⁻)

The hyperpolarization phase of the action potential is due to:

• the prolonged opening of voltage-gated K⁺ channels

• the opening of voltage-gated Cl⁻ channels

• the closure of resting Na⁺ channels

Which portion of the nervous system is responsible for returning the body to normal after an emergency has occurred?

• • parasympathetic nervous system

• • sensory somatic system

• • sympathetic nervous system

The sympathetic nervous system postganglionic neuron releases what neurotransmitter?

• Acetylcholine

• Norepinephrine

• Both Acetylcholine and Norepinephrine

• Arginine

The postganglionic neuron releases what neurotransmitter in the parasympathetic nervous system?

• Dopamine

• Arginine

• Acetylcholine

• Norepinephrine

How is the parasympathetic branch of the autonomic nervous system organized?

• Short preganglionic fiber, long postganglionic fiber

• Short preganglionic fiber, short postganglionic fiber

• Long preganglionic fiber, short postganglionic fiber

• Long preganglionic fiber, long postganglionic fiber