Muscles And Synapses

Question 1

3 types of neurons

Answer 1

Afferent
Ifferent
Interneurons

Question 2

Afferent neurons

Answer 2

Carry info from periphery to spinal cord via dorsal roots, excititory

Question 3

Ifferent neuron

Answer 3

Carry info form spinal cord to periphery via ventral roots, excitatory

Question 4

Interneurons

Answer 4

Carry info between neurons, both excitatory and inhibitory

Question 5

Glia cells produce?

Answer 5

Myelin

• Schwann cells in PNS
• olidogendrocytes in the CNS

Question 6

Glia cells form the

Answer 6

Blood brain barrier

Question 7

Glia ce3lls guide migrating

Answer 7

Neurons and direct animal outgrowth during development (radical glia)

Question 8

Satellite glia

Answer 8

Produce strucure and support isolating neurons form 1 to another

Question 9

Dentrites

Answer 9

Receive stimuli,

Question 10

Dendrites produce generator or receptor potentials :

Answer 10

In motor neurons and association neurons, produce excitatory postsynaptic potentials (EPSP) and inhibitory postsynaptic potentials (IPSP)

Question 11

Cell body

Answer 11

Receive stimuli and produce EPSPs and IPSPs through activation of chemically or mechanically gated ion channels

Question 12

Junction of axon hillock and initial segment of axon

Answer 12

Trigger cone, integrates EPSPs and IPSPs and, if sum is a depolarization that reaches threshold, intimates potential (nerve impulse)

Question 13

Axon

Answer 13

Propagates nerve impulse form initial segment (form dentrites) to axon terminals, impulse amplitude does not change as it propagates along the axon,

Question 14

Axon terminals and synaptic end bulbs

Answer 14

Inflow of Ca2+ causes depolarization of nerve impulses trigger NT release by exocytosis of synaptic vesicles

Question 15

Resting membrane potential

Answer 15

Measure of electrical potential difference between intercellar environment and extra cellular environment
(70mV)

Question 16

What’s involved in primarily setting the resting membrane potential

Answer 16

Ions (K+ and Na+)

Question 17

net - charge is set up by

Answer 17

Na/K pump

Question 18

Na/K pump

Answer 18

• Electrogenic as it moves charge across memb.

- ATP hydrolysis

Question 19

K wants to diffuse _______ the cell

Na wants to diffuse _______ the cell

Answer 19

K wants to diffuse out of the cell

Na wants to diffuse into the cell

Question 20

Resting membrane potential is set by

Answer 20

Leak channels

Question 21

Leak channels are

Answer 21

Alway open, allow passive flow of i9ons in and out of the neuron

Question 22

Are leak channels selective ? What are they powered by ?

Answer 22

Yes. Powered by chemical and electrical gradients

Question 23

Equilibrium potential is when the membrane potential at which the

Answer 23

Chemical conc. Gradient is balanced

Question 24

K leak channel equilibrium pot.

Answer 24

-90mV

Question 25

Na leak channel equilibrium pot.

Answer 25

+60mV

Question 26

The m,ore permeant the ion, the

Answer 26

Greater the force Em towards its own equilibrium potential

Question 27

Between K and Na, which has greater permeability

Answer 27

K, that’s why the RMP is closer to K then Na, at -70mV