Chapter 37 Flashcards Preview

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Flashcards in Chapter 37 Deck (30):
1

neurons

cells that transfer information

2

cell body

where neurons organelles are

3

dendrites

highly branched extensions that receive signals

4

axon

transmits signals to other cells

5

synapse

junction between cells

6

neurotransmitters

chemical messengers that pass info between cells

7

glial cells

supporting cells

8

sensory neurons

transmit information

9

interneurons

integrate information and connect neurons

10

motor neurons

transmit signals to muscle cells

11

central nervous system

neurons that carry out integration

12

peripheral nervous system

neurons that carry info to and from central system

13

membrane potential

difference in charge between the outside and inside of a cell

14

the inside of a cell is _______ charged compared to the outside

negatively

15

resting potential

membrane potential of a neuron not sending signals

16

sodium potassium pumps

use ATP to maintain potassium and sodium gradients across membrane

17

K is higher ______ the cell

inside

18

Na is higher ______ the cell

outside

19

what do sodium and potassium do in neurons

form resting potential

20

gated ion channels

channels that open or close in response to stimuli

21

depolarization

reduction in the magnitude of the membrane potential

22

action potential

massive change in membrane voltage

23

threshold

value that when it is reached causes an action potential

24

refractory period

time after an action potential where a second action potential can be initiated

25

myelin sheath

enables fast connection of action potentials

26

Schwann cells

myelin sheaths in peripheral nervous system

27

oligodendrocytes

myelin sheaths in central nervous system

28

nodes of ranvier
What are they and what is found there

gaps in myelin sheaths where voltage gated Na channels are found

29

saltatory conduction

action potential skipping along nodes of Ranvier

30

ligand gated ion channels (where are they and what do they aid in)

in a post synaptic cell aid in synaptic transmission