Old quizes and midterm

Question 1

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

Answer 1

False

Question 2

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

Answer 2

unable

Question 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)

Answer 3

True

Question 4

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

Answer 4

Sodium ions

Question 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

Answer 5

Brain

Question 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

Answer 6

brain and spinal cord

Question 7

Excitatory signals have a ________ effect.

a. hyperpolarizing
b. negative
c. positive
d. depolarizing

Answer 7

depolarizing

Question 8

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

Answer 8

Oligodendrocytes

Question 9

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

Answer 9

Microglia

Question 10

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

Answer 10

Astrocytes

Question 11

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

Answer 11

Ependyma

Question 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

Answer 12

preganglionic parasympathetic nerves

Question 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

Answer 13

releases neurotransmitter at the effector cell

Question 14

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

Answer 14

Calcium

Question 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

Answer 15

B. Sympathetic postganglionic neuron innervating the gastrointestinal tract

Question 16

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

Answer 16

3 sodium

2 potassium

Question 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

Answer 17

SA Node

Question 18

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

Answer 18

D. II

Question 19

Another name for sympathetic nervous system outflow is the:

a. craniosacral outflow
b. thoracolumbar outflow

Answer 19

b. thoracolumbar outflow

Question 20

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

Answer 20

False

from slightly negative to positive

Question 21

All of the following

Answer 21

a