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Flashcards in Old quizes and midterm Deck (21)
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1

Schwann cells are the main neurons of the spinal cord (T/F)

False

2

The absolute refractory period is a brief time when a neuron is (able or unable) to conduct another action potential?

unable

3

A nerve fibers obeys the all-or-none law isofar as it either fires or does not fire depending on whether the stimulus is above threshold? (t/f)

True

4

With an action potential, depolarization of the axomembrane is recorded as the gates open, allowing __________ to flow into the axon

Sodium ions

5

The advantage of a reflex arc is responding to a painful stimulus is that it saves reaction time by bypassing:
a. spinal cord
b. brain
c. sensory nerves
d. motor nerves

Brain

6

The central nervous system is composed of:
a. motor and sensory nerves
b. autonomic nerves
c. sympathetic and parasympathetic nervous system
d. the brain and the spinal cord

brain and spinal cord

7

Excitatory signals have a ________ effect.
a. hyperpolarizing
b. negative
c. positive
d. depolarizing

depolarizing

8

Which neuroglial cell is responsible for myelin formation on axons in the CNS?

Oligodendrocytes

9

Which neuroglial cell will phagocytized tissue debris when nervous tissue is damaged?

Microglia

10

Which neuroglial cell will contribute to the structure of the blood-brain barrier?

Astrocytes

11

Which neuroglial cell lines the ventricles of the brain and the central canal of the spinal cord and aid in CSF production?

Ependyma

12

The cells bodies (soma) of which of the following structures lie in the brainstem and sacral cord areas?
a. preganglionic sympathetic nerves
b. postganglionic sympathetic nerves
c. preganglionic parasymp nerves
d. postganglionic parasymp nerves

preganglionic parasympathetic nerves

13

A postganglionic neuron...
a. releases neurotransmitter at the effector cell
b. has its axons exiting the CNS through the cranial nerves
c. has its cell body in the brain or spinal cord
d. is the first part of an autonomic motor pathway
e. has a myelinated axon

releases neurotransmitter at the effector cell

14

release of neurotransmitter requires entry of what substance into the nerve terminal?

Calcium

15

Acetylcholine is released from the terminal of each of the following neurons EXCEPT:
a. sympathetic preganglionic neurons innervating the adrenal medulla
b. Sympathetic postganglionic neuron innervating the gastrointestinal tract
c. parasympathetic postganglionic neuron innervating the pupil of the eye
d. Motor nerve innervating skeletal muscle

B. Sympathetic postganglionic neuron innervating the gastrointestinal tract

16

The sodium-potassium pump pumps _____ sodium ions out and ______ potassium ions in

3 sodium
2 potassium

17

postsynaptic nicotinic receptors are found at each of the following sites except:
a. autonomic ganglia
b. skeletal muscle motor end plates
C. Adrenal medulla
d. SA node

SA Node

18

parasympathetic nerves are carried in each of the following cranial nerves except:
A. VII
B. X
C. IX
D. II

D. II

19

Another name for sympathetic nervous system outflow is the:
a. craniosacral outflow
b. thoracolumbar outflow

b. thoracolumbar outflow

20

An action potential changes the charge inside the axon from positive to negative? (T/f)

False
from slightly negative to positive

21

All of the following

a