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BIOLOGY > Topic 6 - Nervous Coordination > Flashcards

Topic 6 - Nervous Coordination Flashcards

1
Q

What is a myelinated nerve fiber?

A

Nerve fibers that are insulated by a myelin sheath

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2
Q

What colour is a myelinated nerve fiber?

A

White

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3
Q

What colour are unmyelinated nerve fibers?

A

Grey

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4
Q

Do myelinated nerve fibers contain nodes of ranvier?

A

Yes

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5
Q

Do unmyelinatednerve fibers contain nodes of ranvier?

A

No

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6
Q

What is the speed of transmission in myelinated nerve fibers?

A

High speed of transmission

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7
Q

What is the speed of transmission in unmyelinated nerve fibers?

A

Low speed of transmission

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8
Q

Where are myelinated nerve fibers located?

A

Central and peripheral nervous system

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9
Q

Where are unmyelinated nerve fibers located?

A

In the central and peripheral nervous system in the group C nerve fibers.

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10
Q

What is impulse conduction like in myelinated nerve fibers?

A

Do not lose the impulse during conduction.

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11
Q

What is impulse conduction like in myelinated nerve fibers?

A

Can lose the nerve impulse during conduction.

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12
Q

What is the length of myelinated axons?

A

Long

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13
Q

What is the length of unmyelinated axons?

A

Short

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14
Q

What is Saltatory conduction?

A

A rapid method by which nerve impulses move down a myelinated axon with excitation occurring at the nodes of ranvier

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15
Q

What happens when the node is at the refractory period?

A

Membrane becomes repolarised
Na+ channel proteins open
K+ channels open

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16
Q

What happens when the node is at the action potential?

A

Membrane fully depolarised
All Na+ channel proteins open
K+ channel proteins closed

17
Q

What happens when the node is becoming depolarised?

A

Membrane Membrane potential moves towards the threshold level Na+ channel starting to open but many still closed
K+ channel proteins closed

18
Q

What happens when the node is at resting potential?

A

Membrane potential around -B27- Na+ channel proteins closed
K+ channel proteins closed

19
Q

What is the myelin?

A

Lipid substance produced by Schwann cells

20
Q

What are Schwann cells?

A

Special cells that create myelin in the peripheral nervous system

21
Q

What are the nodes of ranvier?

A

Gaps in myelin sheath with sodium channels

22
Q

What is an action potential?

A

Electrical signal generated at the axon

23
Q

What is depolarisation?

A

Process of sodium influx causing axon activation

24
Q

What is saltatory conduction?i

A

When the impulse ‘jumps’ from one node of Ranvier to the next, resulting in rapid conduction.

25
Q

What happens to the node in saltatory conduction in the refractory period?

A

Membrane becoming depolarised
Na+ channel proteins close
K+ channels open

26
Q

What happens to the node in saltatory conduction at the action potential?

A

Membrane fully depolarised
All Na+ channel proteins open
K+ channel proteins closed

27
Q

What happens to the node in saltatory conduction during depolarisation?

A

Membrane potential moving towards the threshold level
Na+ channels starting to open but many still closed. K+ channel proteins close

28
Q

What happens to the node in saltatory conduction at the resting potential?

A
  • Membrane potential around -70mV
  • Na+ channel proteins closed
  • K+ channel proteins closed.

BIOLOGY (41 decks)

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