Brainscape's Knowledge GenomeTM

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


See full index

PHYSIO > NERVE PHYSIO - Local Current Flow > Flashcards

NERVE PHYSIO - Local Current Flow Flashcards

0
Q

Local current flow is the..

A

Net movt of positive charge

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

Wave of depolarization across the membrane

A

Local current flow

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

Each action potential triggers a new one at the adjacent area of the membrane by

A

Local current flow

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

Flow of positive charges

A

Active area or active point

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

No stimulus applied

A

Inactive point

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

Current of positive charge moves from INACTIVE point to ACTIVE point

A

Extracellular fluid

EIA

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

Current of positive charge will move from

ACTIVATED -> INACTIVE POINT

A

Intracellular

IAI

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

Characteristic of nerve impulse

A

Self propagating
Decrement less
Bidirectional
Velocity of the impulse

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

Always have to reach its final destination

A

Self propagating

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

Magnitude of a potential will not change as it moves across the membrane

A

Decrement less

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

Velocity of impulse will vary depending on the

A

Diameter of the fiber

Whether the nerve fiber is myelinated or unmyelinated

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

Difference of active area or inactive area

A

Active point is the Flow of positive charges

while inactive point, there is no stimulus applied.

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

Ecf vs icf

A

Ecf- current of + charge moves from inactive to active

Icf-current of + charge moves from active to inactive

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

Characteristics of nerve impulse

A 
Self propagating
Decrementless
Bidirectional
Velocity of impulse
All or none principle
Exhibits refractory period
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is self propagating?

A

Always have to reach its final destination

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

Decrementless?

A

Magnitude of a potential will not change as it moves across the membrane

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

Why is conduction in myelinated fiber faster than unmyelinated?

A

In myelin sheath, there is an uninsulated area which is the node of ranvier. It causes saltatory conduction wc is jumping from one node of ranvier to another

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

What is an impulse

A

It is an electric current aka action potential

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

Diff types of nerve fibers

A

A fiber
B fiber
C fiber

19
Q

A fiber

A

Large myelinated

Conduct impulse at greatest speed

20
Q

B fiber

A

Smaller myelinated

Slower conduction

21
Q

C fiber

A

Smallest unmyelinated

Slowest conduction

22
Q

What is multiple sclerosis

A

It is a degenerative disease in wc there is an impaired nerve fiber

23
Q

What is all or none principle

A

Response of a single nerve fiber is always maximized for the existing conditions at that time
It will either respond or not respond at all
There is accurate transmission of impulse

24
Q

What is refractory period?

A

Aka as rest period

Nerve is unexcitable between the time of depolarization and upper 1/3 of repolarization

25
Q

2 types of refractory period

A

Absolute ref period

Relative ref period

26
Q

Absolute refractory?

A

After a nerve has conducted an impulse, cannot immediately conduct a 2nd impulse at the 2nd time.

27
Q

Relative refractory?

A

2nd stronger stimulus given, reaction will occur

28
Q

What is a synapse?

A

A site of interaction between 2 neurons or between a neuron and effector cells

29
Q

Effector cells?

A

Muscle cells or glands

30
Q

2 types of synapse

A

Chemical synapse

Electrical synapse

31
Q

What kind of synapse is nmj

A

Chemical synapse

32
Q

Electrical synapse is between

A

Neuron to neuron

33
Q

Chemical synapse is between

A

Muscle to nerve

No anatomical continuity

34
Q

Presynaptic neuron

A

Moves the impulse toward the synapse

35
Q

Postsynaptic neuron

A

Moves the impulse away from the synapse

36
Q

Contain transmitter sybs that either excites or inhibits postsynap neuron

A

Transmitter vesicles

37
Q

Provide atp

A

Mitochondria

38
Q

Small swelling on an axon branch lying very close to the dendrite of another neuron

A

Axon bulb

39
Q

Expanded tip of axon facing sarcolemma

Contain alot of mito and neurotransmitters

A

Synaptic knob

40
Q

Cell membrane of muscle tissue

A

Sarcolemma

41
Q

Space in bet

A

Synaptic cleft

42
Q

Enzyme win synaptic cleft that breaks down acetylcholine into cholic acid and acetyl

A

Acetylcholinesterase

43
Q

Impulse transmission across the synapse

A

Synthesis and storage of ach
Release of transmitter substance via exocytosis
Binding of tranmitter with a receptor forming transmitter receptor complex
End plate potential causing action potential
Dissipation of the transmitter substance

44
Q

Characteristics of impulse conduction across the synapse

A

Operates in one direction only
Conduction is slow
Synapse is vulnerable to drug or toxin
Susceptible to fatigue

PHYSIO (8 decks)

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