Lecture 6 Part 2 Neurons

Question 1

Define graded potential

Answer 1

A small change in membrane polarity that occurs within the cell body/dendrites

Question 2

Receptor potential vs graded potential

Answer 2

A receptor potential is a type of graded potential that occurs in the sensory receptors

Question 3

What type of stimulus does the pacinian corpuscle respond

Answer 3

Deep touches

Question 4

The stimulus for the pacinian corpuscle opens what type of gated ion channels?

Answer 4

Mechanically gated sodium ion channels

Question 5

Graded potentials vs threshold potentials

Answer 5

Graded potentials are changes in the membrane polarity that aren’t strong enough to create an action potential, unless it is able to overcome threshold potential. (The limit of Mv that must be reached for an action potential to occur)

Question 6

Can you feel a graded potential that has not reached threshold potential?

Answer 6

No

Question 7

Temporal summation.

Answer 7

A single presynaptic neuron creating multiple G.P within the cell.

Question 8

Spatial summation

Answer 8

Multiple presynaptic neurons creating G.P thats attempting to Cause an A.P

Question 9

When resting membrane potential drops below -70 Mv, what is this called?

Answer 9

Hyperpolarization

Question 10

When resting membrane potential rises above -70 Mv, what is this called?

Answer 10

Depolarization

Question 11

What is an ipsp

Answer 11

Inhibitory post synaptic potential

Question 12

What is epsp

Answer 12

Exhibitory post synaptic potential

Question 13

Where do ipsp and epsp occur?

Answer 13

Within dendrites/cell body

Question 14

Is ipsp a form of hyperpolarization or depolarization?

Answer 14

Hyperpolarization

Question 15

Is epsp a form of hyperpolarization or depolarization

Answer 15

Depolarization

Question 16

If an Na+ ion channel opened, would that be ipsp or epsp?

Answer 16

Epsp

Question 17

If a k+ ion channel opened, would that be ipsp or epsp?

Answer 17

Would cause ipsp

Question 18

What are 3 types of ion channels

Answer 18

Voltage gated ion channels, ligand gated ion channels, and G protein gated ion channels

Question 19

Describe the events in a synaptic transmission

Answer 19

Pre synaptic neuron reaches threshold potential, creating an action potential. AP moves down the axon to the axon terminals where it then sends neuron transmitters to the post synaptic dendrites

Question 20

What is the ligand called for a nicotinic receptor

Answer 20

Acetylcholine (ach)

Question 21

How is the nicotinic receptor gated?

Answer 21

The channel is closed until binded with the Ligand ach. (Ligand gated)