Ch. 12 - Evolve Test

Question 1

1. the structure and functional centre of the entire nervous system is the

Answer 1

central nervous system

Question 2

2. nerves that originate from the brain are called

Answer 2

cranial nerves

Question 3

3. the somatic nervous system carries information to the

Answer 3

skeletal muscles

Question 4

4. the efferent pathways of the autonomic nervous system can be divided into the

Answer 4

parasympathetic and sympathetic divisions

Question 5

5. excitable cells that conduct the impulses are called

Answer 5

neurons

Question 6

the _______ of a neuron is a single process that usually extends from a tapered portion of the cell body

Answer 6

axon

Question 7

Which of the following is not a structural classification of neurons?

Answer 7

polar

Question 8

A signal conduction route to and from the central nervous system is a (an):

Answer 8

reflex arc

Question 9

9. Bundles of myelinated fibers make up the:

Answer 9

white matter of the nervous system.

Question 10

10. Neurons have:

Answer 10

very limited capacity to repair themselves.

Question 11

A membrane that exhibits a membrane potential is said to be:

Answer 11

polarized

Question 12

The membrane potential maintained by a nonconducting neuron’s plasma membrane is called the ___________ membrane potential.

Answer 12

resting

Question 13

The active transport mechanism in the plasma membrane that transports sodium and potassium ions in opposite directions and at different rates is the:

Answer 13

sodium-potassium pump

Question 14

An ion channel that opens in response to a sensory stimulus is a (an):

Answer 14

stimulus-gated channel.

Question 15

15. A term commonly used as a synonym for action potential is:

Answer 15

nerve impulse.

Question 16

16. The brief period during which a local area of an axon’s membrane resists restimulation is called the ____________ period

Answer 16

refractory

Question 17

17. The action potential seems to “leap” from node to node along a myelinated fiber. This type of impulse regeneration is called _____________ conduction.

Answer 17

salutatory

Question 18

18. There are two types of synapses—the electrical synapse and the ____________synapse.

Answer 18

chemical

Question 19

19. Which chemicals allow neurons to communicate with one another?

Answer 19

Neurotransmitters

Question 20

20. Which neurotransmitter is unique because of its chemical structure: acetate (acetyl-coenzyme-A) with choline?

Answer 20

Acetylcholine