Intro To Nervous System II

Question 0

Resting membrane potential

Answer 0

-70 mV

Question 1

Graded potential of Interneuron dendrites –> axon of Interneuron forms – –, neurotransmitter release at next Interneuron

Answer 1

Action potential

Question 2

What Na K pump does

Answer 2

Create resting membrane potential via unequal distribution of ions
3 Na+ out
2 K+ in pumpkin

Question 3

– makes inside of membrane more NEG, so it’s harder for action potential to occur

Answer 3

Hyper polarization

Question 4

In –, membrane becomes less - / more +

Answer 4

Depolarization

Think :D as in happy = more positive

Question 5

2 main phases of action potential

Answer 5

Depolarization - Na+ into cell (more +)

Repolarization - K+ out of cell

Question 6

In the Repolarizing phase, – ions flow OUT of the cell and the inside of the membrane becomes more –

Answer 6

Repolarization = k+ ions leaving the cell => membrane becomes more negative

Question 7

In the – phase, the resting potential becomes even more NEGATIVE than resting membrane potential

Answer 7

Hyperpolarizing

Question 8

The more intense the stimulus, the more – the action potential generation

Answer 8

More frequent action potential generation

Question 9

Factors (3) increasing speed of propagation

Answer 9

Increased myelination
Larger axon diameter
Higher temperature

Question 10

Which is faster, chemical or electrical synapses

Answer 10

Electrical synapses

Question 11

In the CNS, new neurons can arise in the – only bc myelination inhibits regeneration

Answer 11

Hippocampus (campus = learning center)

Question 12

What 3 features can do repair in the PNS?

Answer 12

Cell body can repair dendrites & axon
NEUROLemma
Nissl bodies