week 6

Question 1

communication w/in neuron is _____ & between neurons is ______.

a. electrical; electrical
b. chemical; electrical
c. electrical: chemical
d. chemical: chemical

Answer 1

c. electrical: chemical

Question 2

When considering how neurons communicate, threshold refers to

a. the doorway or gate through which neurotransmitters travel.
b. the level of stimulation required to trigger an action potential.
c. the receptive area on the postsynaptic neuron.
d. the transitional area between the cell body and axon where the action potential begins.

Answer 2

b. the level of stimulation required to trigger an action potential.

Question 3

Ion channels that are sensitive to changes in the cell membrane potential are called
Select one:

a. inhibitory
b. voltage-gated ion channels
c. excitatory
d. chemically-gated ion channels

Answer 3

b. voltage-gated ion channels

Question 4

once released into synapse, neurotransmitters

a. bind to specific receptors
b. stay in synapse & attract ions
c. travel inside neurons
d. attach to vesicles

Answer 4

a. bind to specific receptors

Question 5

A neurotransmitter that is involved in inhibition and has been targeted in the treatment of seizure disorders is

a. Epinephrine
b. Dopamine
c. serotonin
d. GABA

Answer 5

d. GABA

Question 6

which of the following is TRUE about generalized seizures:

a. simple generalized seizures are 1 of several subtypes
b. there’s always seizure activity in both cerebral hemispheres
c. there’s no change in consciousness
d. they’re always idiopathic, never symptomatic

Answer 6

b. there’s always seizure activity in both cerebral hemispheres

Question 7

A change in the membrane potential of a neuron from -70 mV to -72 mV is

a. an EPSP
b. threshold
c. an IPSP
d. exocytosis

Answer 7

c. an IPSP.

Question 8

A neuron is excited by a stimulus just stronger than the neuron’s threshold of excitation. The resulting action potential has a strength of 10 (in some arbitrary units). After an interval of a few minutes, a new stimulus is applied that is twice as intense as the previous one. The resulting action potential will have what strength (using the same units as before)?

a. 5
b. 10
c. 20
d. impossible to predict

Answer 8

b. 10 - action potential is ALL or NOTHING, meaning 10 is ALL, cannot be increased or decreased (unless decreased to nothing).

Question 9

all of the following are true about postsynaptic potentials EXCEPT:

a. they are changes in electrical charge
b. can be labeled EPSP or IPSP
c. result from neurotransmitters binding to their receptors
d. travel length of the axon.

Answer 9

d. travel length of the axon.

Question 10

on the numbered neuron image, which structure numbered on the diagram is best described as the major signal-receiving area?

Answer 10

structure #1