Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

MED 310A > action potential > Flashcards

action potential Flashcards

1
Q

how are neurons named?

A

shape
anatomical features
neurotransmitter
function

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is the input zone of a neuron? (gets info)

A

dendrite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

where is the integration zone of a neuron?

A

cell body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

where is action potential initiated in a neuron?

A

axon hillock

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

where does the signal leave the neuron?

A

axon terminal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

is an axon long or short?

A

long

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what is an action potential?

A

an electrical signal that travels from one end of a cell to the other rapidly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what are the 4 major ions responsible for membrane potential?

A

K
Na
Cl
Ca2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what do electrical signals in neurons depend on?

A

rapid changes in membrane potential

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what do ion channels do?

A

mediate the flow of ions that underlie the electrical signals in excitable cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what is the structure of ion channels?

A

a protein with a water filled pore for ions to go through

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what are the properties of ion channels?

A

acts as specific filters
conducting and non-conducting states (open and closed)
gating

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

why do ion channels gate?

A

changes in membrane potential
ligand binding
mechanical forces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

describe step 1 of the action potential of K and Na voltage-gated channels;

A

initial depolarization. caused by trigger. Na channels open

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

describe step 2 of the action potential of K and Na voltage-gated channels;

A

reaches threshold

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

describe step 3 of the action potential of K and Na voltage-gated channels;

A

explosive depolarization. Na feed-back loop

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

describe step 4 of the action potential of K and Na voltage-gated channels;

A

peak potential. Na begins to close and K opens.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

describe step 5 of the action potential of K and Na voltage-gated channels;

A

repolarization begins with Na closed and K open

19
Q

describe step 6 of the action potential of K and Na voltage-gated channels;

A

afterhyperpolarization. both cahnnels closed. cannot be restimulated at this stage

20
Q

describe step 7 of the action potential of K and Na voltage-gated channels;

A

resturn to rest ready to be restimulated

21
Q

action potentials are…

A

all or none

22
Q

what type of channel does action potential rely on?

A

voltage gated channels

23
Q

why don’t action potentials wane in size down the axon?

A

they are regenerative

24
Q

what prevents the backward propagation of action potential in the hillock?

A

the refractory period

25
Q

what are the roles of the refraactory period?

A

prevent backward propagation
limit firing frequency

26
Q

what is the absolute refratory period?

A

no Na channels available so it is impossible to fire an action potential

27
Q

what is the relative refratory period?

A

more hyperpolarization makes it harder to fire an action potential but not impossible

28
Q

since action potentials are all-or-none, how are differences in the signal intensity conveyed?

A

firing frequency
pattern of action potentials

29
Q

what is saltatory conduction?

A

what action potential jumps from one node of ranvier to the next

30
Q

what type of cells provide myelin?

A

glial

31
Q

what is myelin mostly made up of?

A

cell membrane

32
Q

electrical current propagates faster and farther along a myelinated axon;
true or false

A

true

33
Q

does myelin conduct current?

A

no

34
Q

is myelin part of the axon?

A

no

35
Q

do thicker axons conduct faster or slower?

A

faster

36
Q

spped corresponds with function;
true or false

A

true

37
Q

what is the associated function with A-alpha nerve fibers?

A

movement sensor, contraction of skeletal muscle

38
Q

what is the associated function with A-beta nerve fibers?

A

touch

39
Q

what is the associated function with A-gamma nerve fibers?

A

acute pain

40
Q

what is the role of nodes of ranvier?

A

propagation and regeneration

40
Q

what factors determine action potential velocity?

A

axon diameter, myelination and Na channel density

40
Q

what is the associated function with C nerve fibers?

A

chronic pain, temp and itch

41
Q

what type of cell in the CNS provide myelin?

A

oligiodendrocytes

42
Q

what type of cells in the PNS provide myelin?

A

schwann cells

MED 310A (15 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions