NS 3 graded potential and synapse

Question 1

what is an action potential (3)?

Answer 1

• all or none event
• propagates along a nerve
• voltage gated channels

Question 2

what is a graded potential?

Answer 2

local change in membrane potential

Question 3

what events can trigger a graded potential?

Answer 3

• Synaptic: post synpatic membrane

- receptors: action of stimulus (mechanical, chemical or thermal gated)

Question 4

where is the location of action potentials?

Answer 4

voltage gated channels

Question 5

what is the ion movement of an action potential?

Answer 5

sodium then potassium through gated channels

Question 6

a depolarisation to threshold triggers an action potential, what triggers a graded potential?

Answer 6

stimulus or neurotransmitter

Question 7

the coding of magnitude of an action potential is all or none, frequency, what about graded potential?

Answer 7

size of potential charge

Question 8

which signal decays with distance?

Answer 8

graded potential

Question 9

which signal is regenerated ?

Answer 9

action potential

Question 10

a graded potential is either depolarization or hyperpolarisation

Answer 10

true

Question 11

name two neurotransmitters

Answer 11

• glutamate

- Acetylcholine

Question 12

postsynaptic inhibition (IPSP) is usually associated with what stage at an action potential?

Answer 12

hyerpolarisation

Question 13

how does presynaptic inhibition occur?

Answer 13

results in decreased neurotransmitter release from presynaptic terminal