Action Potentials

Question 1

Oligodendrocytes

Answer 1

CNS

Produce myelin around axons

Question 2

Schwann cells

Answer 2

PNS

Produce myelin around axons

Question 3

Ganglia

Answer 3

PNS

Neuron cell bodies of the same type clustered together

Question 4

Nuclei

Answer 4

CNS

Neuron cell bodies of the same type clustered together

Question 5

Glial cells

Answer 5

Structural and supportive roles

Include: Astrocytes, Ependymal cells, Microglia, Oligodendrocytes, and Schwann cells

Question 6

Astrocytes

Answer 6

Nourish neurons

Form blood-brain barrier

Question 7

Ependymal cells

Answer 7

Produce cerebrospinal fluid, which physically supports the brain and serves as a shock absorber

Question 8

Microglia

Answer 8

Phagocytic cells that ingest and break down waste products and pathogens in CNS

Question 9

depolarization

Answer 9

Excitatory input causes depolarization, raising the membrane potential (more +)

Question 10

hyperpolarization

Answer 10

Inhibitory input causes hyperpolarization, lowering the membrane potential (more -)

Question 11

temporal summation

Answer 11

multiple signals are integrated during a relatively short period of time

Question 12

spatial summation

Answer 12

the additive effects are based on the # an location of the incoming signals.

Question 13

absolute refractory period

Answer 13

no amount of stimulation can cause another action potential to occur

Question 14

relative refractory period

Answer 14

there must be a greater than normal stimulation to cause an action potential because neuron is hyperpolarized