Study Aide,

Question 1

What are the two parts of the CNS?

Answer 1

Brain & Spinal Cord

Question 2

Which of the following neuroglia is the most abundant?

Answer 2

Astrocytes

Question 3

T/F Anterograde axonal transport involves movement from the soma toward the axon terminal

Answer 3

True

Question 4

Match the Following:
A Fibers
C Fibers

Answer 4

A Fibers: large diameter; myelinated
C Fiber’s: small Dimeter, un myelinated

Question 5

T/F Neurons Communicate with Physical touch

Answer 5

False

Question 6

Which is not true regarding graded/local potentials?

Answer 6

they are caused by local changes in ion flow? or It is propagated along the whole membrane identically?

Question 7

Which of the following are true about Saltatory Conductions (Select all)

Answer 7

APs jump from one node of ranvier to the next
GUESS A SECOND ANSWER

Question 8

T/F norepinephrine is an example of a neurotransmitter that causes an excitatory response

Answer 8

True

Question 9

Select all mechanisms that turn off stimulation of synaptic signaling

Answer 9

neurotransmitter diffuses away, synaptic knob reabsorbs amino acids and monoamines, Acetylcholinesterase degrades ACH in synaptic cleft

Question 10

Which are true about the absolute refractory period (select all)

Answer 10

it maintains one-way flow, it is harder to fire a new AP

Question 11

Which neuron would Activate to a muscle?

Answer 11

A
-looks like spikey lollypop

Question 12

Match the Following: Synaptic Vesicles

Answer 12

C

Question 13

Match the following: Calcium Ions

Answer 13

A

Question 14

Match the Following: Post Synaptic Membrane

Answer 14

B

Question 15

Match the following: Synaptic Cleft

Answer 15

D

Question 16

Which neuron would be found in the retina of the eye

Answer 16

B

Question 17

Which neuron is a sensory neuron found in a reflex arch?

Answer 17

C
-looks like rope with frayed edges

Question 18

Which Neuron is typically involved in the special senses of sight and smell?

Answer 18

B
-looks like eye

Question 19

Match the Following: Ion Channel

Answer 19

E

Question 20

An action potential is regarded as an example of a positive feedback, Which of the following examples below best illustrated the positive feedback aspect of an action potential

Answer 20

A threshold stimuli will cause the opening of a voltage gated sodium ion channels that will cause further depolarizing stimulus. This stimulus will open still more voltage gated sodium ion channels

Question 21

During the refractory period of an action potential, a larger than normal stimulus is needed to cause another action potential. This is due to the fact that…

Answer 21

the voltage gated potassium ion channels remain open long enough to hyperpolarize the axon membrane

Question 22

The effect of acetylcholine can be stimulating or inhibiting. Which of the following gives the best explanation for why this is so?

Answer 22

different postsynaptic cells will have different receptors

Question 23

Imagine a neuron that has several hundred axonal knobs impinging on it. The majority of these exonal knobs are shown to be ‘firing”. However, the neuron in question does not transmit an impulse. Give a valid explanation as to why this could occur.

Answer 23

Both excitatory and inhibitory potentials impinge on neurons. In this case, inhibitory postsynaptic potentials (IPSPs) outnumber EPSPs, and due to the IPSP neurotransmitter that is beingreleased and its action, the postsynaptic neuron is inhibited from “firing” (hyperpolarized).

Depolarization does not reach threshold value to “fire” (must reach -50 to -55 mV to produce an AP)

Question 24

When one or more presynaptic neurons fire in rapid order it produces a much greater depolarization of the post synaptic membrane than would result from a single EPSP; this event is called _______ summation.

Answer 24

Temporal