Quiz 6 questions

Question 1

A change in the membrane potential of a neuron from a value of -70mV to a value of -60mV would be called:
Depolarization
Hyperpolarization
Action potential
Repolarization

Answer 1

Depolarization
(becomes more positive)

Question 2

Which molecule is sent out of the neuron during an action potential, and which is brought in?
K+, Na+
Na+, K+
Ca++, K+
K+, Ca++

Answer 2

K+, Na+

Question 3

Though the membrane of a “resting” neuron is highly permeable to potassium ions, its membrane potential does not exactly match the equilibrium potential for potassium because the neuronal membrane is:
Fully permeable to sodium ions
Slightly permeable to sodium ions
Fully permeable to calcium ions
Impermeable to sodium ions

Answer 3

Slightly permeable to sodium ions

Question 4

Threshold stimuli are stimuli that are strong enough to:
Repolarize the neuron membrane
Cause a net flux of positively charged ions from inside to outside the cell
Cause a net influx of positively charged Na+ ions from outside to inside the cell
Close potassium channels to the point that an action potential is initiated
Open potassium channels to the point an action potential is initiated

Answer 4

Cause a net influx of positively charged Na+ ions from outside to inside the cell

Question 5

Acetylcholine released into the junction between a motor neuron and a skeletal muscle binds to a sodium channel and opens it. The sodium channel is a :
Voltage-gated sodium channel
Voltage-gated potassium channel
Ligand-gated sodium channel
Second-messenger-gated channel

Answer 5

Ligand-gated sodium channel

Question 6

Which of the following activities would be associated with the sympathetic division of the nervous system?
Rest and digestion
Release of acetylcholine
Decreased heart rate
Fight-or-flight response
Increased glycogen production

Answer 6

Fight-or-flight response

Question 7

Which of the following describes the functional controls of Wernicke’s area?
It is active when speech is heard and comprehended
It is active during the generation of speech
It coordinates the response to olfactory sensation
It is involved in the formation of long-term memories

Answer 7

It is active when speech is heard and comprehended

Question 8

The hippocampus is responsible for___.
Forming new long term memories
Retaining long-term memories
Forming short term memory and maintaining long-term memories
forming short term and long term memories

Answer 8

Forming short term memory and maintaining long-term memories