Chapter 11: Fundamentals of the Nervous System

1) Threshold stimulus Na+ channels open. 2) Na+ influx depolarization 3) Na+ channels close and K+ channels open 4) K+ efflux repolarization 5) Hyperpolarization K+ channels close

Place the events involved in generation of an action potential in the correct order of occurrence from left to right.

What type of stimulus is required for an action potential to be generated? A) hyperpolarization B) a threshold level depolarization C) multiple stimuli D) a suprathreshold stimulus

B) a threshold level depolarization

positive

Outside of the neuron is ____________ at resting membrane potential.

A) voltage-gated channels.

During the action potential, what channels open and close to alter the permeability of the plasma membrane to Na+ and K+ ions? A) voltage-gated channels B) leakage channels C) chemically gated channels D) membrane channels are not required.

C) C

In which area of the neuron is an action potential initially generated? A) A B) B C) C D) D

negative

Inside of the neuron is ___________ at resting membrane potential

D) D

Which of the cell types shown is most associated with the production and flow of cerebrospinal fluid (CSF)? A) A B) B C) C D) D

K+ (POTASSIUM)

The concentration of _______ is higher inside than outside the cell.

Na+ (SODIUM)

The concentration of ________ is higher outside than inside the cell.

K+ (POTASSIUM)

The membrane is more permeable to _______.

K+ (POTASSIUM) Na+ (SODIUM)

The resting membrane potential is maintained by Na+-K+ pumps that actively transport _____ into and ____ out of the cell

-70mV

The resting membrane potential of a neuron averages _______mV.

B) multipolar

What structural classification describes this neuron? A) unipolar B) multipolar C) pseudounipolar D) bipolar

C) both A and B

Which areas of this neuron would be classified as receptive regions? A) D only B) E only C) both A and B D) both A and E

D) C and D

Which of the following membrane regions would have significant numbers of voltage-gated ion channels? A) A only B) D only C) A and B D) C and D

E) E

Which of the neuroglial cell types shown are found in the peripheral nervous system (PNS)? A) A B) B C) C E) E

A) A

Which of the neuroglial cell types shown form myelin sheaths within the CNS? A) A B) B C) C D) F