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Flashcards in Neuro physio Deck (43):
1

Creates myelin in CNS

Oligodendrocytes
Schwann cells in PnS

2

Unmyelinated portions of axons

Nodes of ranvier

3

Where action potential in neuron starts

Axon hillock

4

Terminal portion that contains vesicles with neurotransmitter

Terminal bouton or end feet or axon terminal

5

Death of axon distal to the site of injury after an axon is transected

Wallerian or anterograde or orthograde degeneration

6

Purpose of retrograde axonal transport

Recycles synaptic vesicle membrane for lysosomal degradation

7

Which NT is deficient in Alzheimer disease

Ach

8

Dopamine is degraded by ________ in presynaptic nerve terminals

MAO
COMT In liver

9

Which part of the pons secretes norepinephrine

Locus ceruleus

10

Serotonin Is secreted mainly by ________

Median raphe of brain stem

11

Serotonin is derivative of which AA

Tryptophan
Melatonin Serotonin niacin

12

Serotonin is converted to __________ in the pineal gland

Melatonin

13

Nitric oxide: inhibitory. True or false?

True!
Derived from arginine

14

Histamine is found mainly in the

Tuberomamillary nucleus of the hypothalamus

15

Number one inhibitory NT in the brain

GABA

16

RMP

-70mV

17

Main contributor to RMP

Nernst Potential

18

Membrane potential at which action potential is inevitable

Threshold

19

Depolarization is caused by

Na influx to the cell via opening of sodium activation gates

20

Repolarization is caused by

K+ efflux --> inside of the cell more negative

21

Two or more presynaptic inputs arrive simultaneously

Spatial Summation

22

Two or more presynaptic inputs arrive in rapid or successive fashin

Temporal summation

23

Nerve fiber for slow pain and temperature

Type C

24

Lesions in __________ cause anterograde amnesia

Hippocampus

25

Lesions in ________ cause retrograde amnesia

Thalamus
Loss of pre existing memories

26

Satiety center

Ventromedial nuclei

27

Sweating

Anterior hypothalamus

28

Master clock

Suprachiasmatic nucleus

29

True or false: melatonin decreased by darkness

False!
Increased by darkness
Inhibited by daylight

30

Secretion of muramyl peptide causes _______

Sleep

31

______ waves are predominant in REM sleep

Beta

32

Stage 2 sleep characterized by

Theta waves
Sleep spindles
K complexes

33

Sympathetic preganglionic neuron

Thoracolumbar distribution

Para is craniosacral

34

Effect of sympathetic NS on bronchioles

Dilates via B2 receptors

35

NT on all preganglionic neurons

Acetylcholine

36

Parasympathetic cranial nerves

CN X IX VII III

10973

37

No parasympathetic fibers in these organs

Ventricles of heart
Almost all blood vessels
Pregnant uterus

38

Renin secretion is mediated by _________ NS

Sympathetic

39

Contraction of radial muscle cause _______

Mydriasis --> increase pupil size

40

Miosis is caused by _______ NS due to contraction of ________

Parasympathetic NS
Contraction of circular muscle

41

Contraction of CILIARY muscle is for _______ vision and mediated by _________ NS

Near vision
Parasympathetic

42

B3 receptor found in

Brown fat

43

Macrophage of brain

Microglia