Glia

Question 1

are glia excitable or non excitable

Answer 1

Non excitable

Question 2

what are the two group of glia in the cns

Answer 2

macroglia and microglia

Question 3

what germ layer gives rise to macroglia

Answer 3

Ectoderm

Question 4

what germ layer gives rise to microglia

Answer 4

Mesoderm

Question 5

give two examples of macroglia

Answer 5

astrocytes and oligodendrocytes

Question 6

what groups of glia are found in the pns

Answer 6

1) schwann cells - non-excitable, excitable
2) olfactory sheathing
3) satellite glial cells
4) enteric glia

Question 7

where do astrocytes extend projections to

Answer 7

nodes of ranvier (axons), dendrites, neural vascular endothelium, under pia mater

Question 8

a single astrocyte makes contact with multiple dendrites of a neuron. true or false

Answer 8

true

Question 9

a single neuron is contacted by multiple astrocytes. true or false

Answer 9

true

Question 10

the presence of which neuronal cell type causes an immature schwann cell to develop into a myelinating cell

Answer 10

neurons

Question 11

can schwann cells turn into immature schwann cells after injury?

Answer 11

Yes

Question 12

microglia are derived from what type of cells

Answer 12

foetal macrophages

Question 13

during embryonic development, embryonic glial cells invade what structure

Answer 13

Neural tube

Question 14

after birth, what structure in the brain do microglia precursor cells invade

Answer 14

corpus callosum

Question 15

give to examples of neuropeptides secreted by glial cells

Answer 15

Angiotensinogen

Atrial natriuretic peptide

Question 16

what does wiring transmission refer to in context of glia

Answer 16

wiring transmission is a form of transmission/signalling

it is:

only intracellular
between only two cells
rapid

Question 17

what is volume transmission in the context of glia

Answer 17

form of transmission/signalling

it is:

intracellular and extracellular
between more than two cells
(a signal released in one cell affects many others)
slow

Question 18

following an action potential, extra extracellular potassium is taken up by which cells

Answer 18

Astrocytes

Question 19

astrocytes have a high potassium conductance. true or false

Answer 19

True

Question 20

how is potassium taken up into astrocytes

Answer 20

1) potassium channels
2) Na/K ATPase pump
3) Na/K/2Cl exchanger

Question 21

after one astrocyte takes up extracellular potassium, the K diffuses between cells through gap junctions. true or false? what is the name of this process

Answer 21

true. spatial buffer