Postlab quiz 5 Flashcards Preview

Physiology Lab > Postlab quiz 5 > Flashcards

Flashcards in Postlab quiz 5 Deck (129)
Loading flashcards...
1

What is a neuron refered to as (video)

multipolar neuron (normal)

2

What is used in the video to dtermine resting membrane potential

electrode attached to voltmeter

3

What instrument did we use in lab

ocilloscope

4

depolarization =

stimulation

5

hyper polarization =

inhibition

6

RMP in podcast

-65 to -95mV

7

What is distrurbed when stimulus takes place

RMP

8

Na+ channels: The channel is closed at this point

RMP

9

Na+ channels: The channel is opened by this

depolarization (AP)

10

Na+ channels: the channel is inativiated during this period

refractory period (absolute)

11

Na+ channels: How is the channel inactivated

opening blocked by protein

12

Na+ channels: These are this type of channel

voltage gated

13

What opens voltage gated channels

ambient voltage

14

when is threshold

-50 mV

15

What is the top of the spike in the podcast

+30Mv

16

What resets RMP

Na/K pumps

17

milliseconds per AP

4 mS

18

AP frequency is determined by

strength of stimulus

19

Strong stimuli are felt more strongly because of this

the rate/frequency of the AP

20

During an absolute RP this occurs

inactivation of Na+ channels

21

During a relative Rp this occurs

hyperpolarizaition due to efflux of K+

22

This is needed to generate a AP during relative RP

greater than normal strength of stimulus

23

These types of neurons are mylinated

motor
sensory

24

rate of impulse conduction mylinated vs unmylinated

300 m/s to 1 m/s

25

Spatial summation:

occurs when excitatory potentials from many different presynaptic neurons cause the postsynaptic neuron to reach its threshold and fire.

26

Temporal summation:

occurs when a single presynaptic neuron fires many times in succession, causing the postsynaptic neuron to reach its threshold and fire.

27

unidirectional propagation

AP can only move in one way due to absolute refractory period (can move in either way to start)

28

Chronaxie time

minimum time required for electrical current that is 2x the strength of the rheobase to stimulate neuron

29

What does chronaxie time measure

excitability

30

rheobase voltage

lowest intensity which just stimulated nerves