Chp. 15 - Nervous Tissue Histology

Question 1

Identify #4-6

Answer 1

4: Nucleolus;
5: Chromatophilic substance or rough endoplasmic reticulum or nissl bodies;
6: axon hillock

Question 2

Identify #1-3

Answer 2

1: Dendrites
2: Cell body;
3: Nucleus

Question 3

Identify #7-9

Answer 3

7: initial segment of axon;
8: neurilemma (sheath of Schwann);
9: Schwann cell (one internode)

Question 4

Identify #10-12

Answer 4

10: Myelin sheath gap (nodes of Ranvier);
11: Terminal branches;
12: Axon terminals

Question 5

Identify A-D.

Answer 5

A: Synaptic vessels;

B: synaptic cleft;

C: ion channel (closed);

D: ion channel (open)

Question 6

Identify E, F, L

Answer 6

E: postsynaptic membrane;

F: axon terminal of the presynaptic neuron;

L: axon of presynaptic neuron

Question 7

Identify G-K

Answer 7

G:

H:

I:

J:

K:

Question 8

Name #1-3

Answer 8

1: axon;
2: myelin sheath;
3: endoneurium???

Question 9

Name #4-6

Answer 9

4: blood vessels;
5: epineurium;
6: perineurium
7: endoneurium

Question 10

a neuron that does not have any neural impulses

Answer 10

resting neuron

Question 11

The difference in electrical charge across the plasma membrane is called _____. Hence, the membrane is said to be ______.

Answer 11

resting membrane potential;

polarized

Question 12

What in the membrane maintains the difference in electrical charge established by diffusion of ions?

Answer 12

sodium-potassium pump

Question 13

The resting membrane potential can be measured with a _______.

Answer 13

voltmeter

Question 14

The neuron receives an adequate impulse known as the ______.

Answer 14

threshold stimulus

Question 15

The action potential follows the _________ law, in which the neuron membrane either depolarizes 100% or not at all.

Answer 15

all-or-none

Question 16

In neurons, the action potential is also called a ________.

Answer 16

nerve impulse

Question 17

When the nerve impulse reaches the axon terminal, it triggers the release of neurotransmitters into a gap, known as the _________.

Answer 17

synaptic cleft

Question 18

Identify the type of glial cell shown.

Answer 18

astrocyte

Question 19

Identify the indicated part of a nerve.

Answer 19

fascicle

Question 20

Identify the indicated part of a synapse.

Answer 20

presynaptic membrane

Question 21

In the PhysioEx exercise, what was the effect of curare on the nerve?

Answer 21

inhibition

Question 22

Identify the indicated part of a neuron.

Answer 22

axon terminals

Question 23

Identify the type of glial cells shown.

Answer 23

ependymal cell

Question 24

Identify the indicated part of a nerve.

Answer 24

axon

Question 25

Identify the indicated part of a neuron.

Answer 25

nissl bodies

chromatophilic substance