Physiology Part 1 Flashcards Preview

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Flashcards in Physiology Part 1 Deck (33)
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1
Q

Ascending phase, influx of sodium

A

Depolarization

2
Q

Descending phase, efflux of potassium

A

Repolarization

3
Q

-90 mV

A

resting state (membrane polarized)

4
Q

permeable to sodium ions

what stage

A

depolarization stage

5
Q

Rapid diffusion of potassium to the exterior

A

Repolarization stage

6
Q

Two gates of voltage gated sodium channel

A

activation and inactivation gates

7
Q

T/F: Inactivation gate will not re-open until membrane potential is at or nearly at “resting membrane potential” level.

A

True

8
Q

Term for most synapses (axon to dendrite)

A

axodendritic

9
Q

Tunnels which connect cytosol of two cells for synaptic transmission

A

Gap junctions (connexons)

10
Q

Do chemical synapses touch?

A

no, very close though

11
Q

What is myelin made of?

A

fat

12
Q

What are the 3 excitatory neurotransmitters?

A

Norepinephrine,
Glutamate,
Nitric Oxide

(eNGiNes excite me)

13
Q

What are the inhibitory neurotransmitters?

A

Glycine, GABA, Serotonin, AcH, Dopamine

GG SAD

14
Q

What do MS, PLS, and ALS all have in common?

A

Demyelinating diseases

15
Q

Which has more presynaptic bulbs, spatial or temporal summation?

A

spatial (takes up more space)

temporal summation only has 1

16
Q

pupil constriction

A

miosis

17
Q

areas of greatest number of pain nociceptors

A

tip of tongue, lips, genitals, finger tips

18
Q

encapsulated mechanoreceptors assessing pressure

A

end bulbs of KRAUSE

19
Q

encapsulated mechanoreceptor,
multi-branched,
perception of temp and pressure

A

corpuscles of RUFFINI

20
Q
Iggo Dome Receptors,
not encapsulated,
anterior spinothalamic tract,
hair follicles,
general touch
A

Merkel’s discs

21
Q

encapsulated fine touch receptors on non-hairy skin

A

meissner’s

22
Q

phasic receptor
quick adaptor
pressure, vibration
encapsulated

A

Pacinian Corpuscles

23
Q

Receptors that are not encapsulated

A

Merkel’s discs

24
Q

Proprioception receptors

A

muscle spindels, Golgi Tendon Organs, and Golgi Tendon Reflex

25
Q

Prevents excessive tension in a muscle

A

Golgi Tendon Reflex

26
Q

Which has cholinergic receptors, sympathetic or parasym?

A

parasym (sym has adrenergic)

27
Q

Absolute refractory

A

no action potential possible

28
Q

Relative refractory

A

action potential available with increase potential

29
Q

many synapses in a single cell

A

spatial summation

30
Q

rapid succession of action potential, few synapses

A

temporal summation

31
Q

these cells normally release glycine, preventing excessive muscular contraction but their respective glycine receptors are blocked during strychnine poisoning.

A

Renshaw cells

32
Q

What is the stimulus for opening sodium channels suring an action potential?

A

depol

33
Q

What is the threshold for stimulus (membrane potential starts at -90mV)?

A

-65mV