Neurophysiology Week 2

Question 1

Presynaptic neuron =

Answer 1

sending neuron

Question 2

Post synaptic=

Answer 2

recieving neuron

Question 3

EPSP stands for

Answer 3

Excited post synaptic potential

Question 4

IPSP stands for

Answer 4

Inhibitory post synaptic potential

Question 5

Neuron cell membrane is______

Answer 5

polarixed

Question 6

resting potential =

Answer 6

-70

Question 7

Only allows certain things through

Answer 7

Bilipid membrance

Question 8

Only allows ions down concentration gradient

Answer 8

Highly permeable

Question 9

There is more ____ inside the cell:

Answer 9

potassium

Question 10

There is more _____ outside the cell

Answer 10

Sodium, chloride ions

Question 11

__ potassium in: __ sodium out

Answer 11

2:3

Question 12

Passive ion distribution includes:

Answer 12

concentration gradients and electrostatic pressue

Question 13

Action ion distribution includes:

Answer 13

pumps

Question 14

Resistant to the passage of protein ions (-)

Answer 14

neuron at rest

Question 15

resistant to the passage of Na+ ions

Answer 15

neuron at rest

Question 16

Able to allow K+ and Cl- ions to pass fairly easily

Answer 16

neuron at rest

Question 17

3 different ways there is a change in permeability

Answer 17

• chemically induced
• voltage induced
• Mechanical (alter shape)

Question 18

Most common voltage to describe neurons:

Answer 18

-70 to -60

Question 19

Depolarization of the membrane (goes toward zero)

Answer 19

EPSP

Question 20

Hyperpolarization of the membrane (becomes more neg)

Answer 20

IPSP

Question 21

when the cell is hyperpolarized before it resets, cell cant fire immediately and cell wont get damaged from firing to quickly and action potential cant fire backward

Answer 21

refractery period

Question 22

Na+ channels open, Na+ begins to enter cell

Answer 22

Step 1: Action potential

Question 23

K+ channels open, K+ begins to leave the cell (becoming to positive)

Answer 23

Step 2: Action potential

Question 24

Na+ channels become refractory, no more Na+ enters cell (K+ stay open)

Answer 24

Step 3: Action potential

Question 25

K+ continues to leave cell, causes membrane potential to return to resting level

Answer 25

Step 4: Action potential

Question 26

K+ channels close, Na+ channels reset

Answer 26

Step 5: Action potential

Question 27

Extra K+ outside diffuses away

Answer 27

Step 6: Action potential

Question 28

The higher amoutn of EPSP will create ___ firing not ___ firing

Answer 28

more not greater

Question 29

Voltage will decay is there is not whta?

Answer 29

additional channels or myelin

Question 30

in bare plasma membrance, voltage ______

Answer 30

decays

Question 31

In nonmyelinated axons, conduction is ____

Answer 31

slow

Question 32

In myelinated axons, conductions is ____

Answer 32

fast (saltatory conduction)

Question 33

the thicker/larger and more myelinated =

Answer 33

faster conduction

Question 34

C fiber =

Answer 34

dull pain; slow

Question 35

Delta fiber =

Answer 35

thicker/larger; pain

Question 36

A fiber =

Answer 36

larger in diameter, allowing more change in cell and they are myelinated