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Human Physiology > Lecture 1 - Cell Membranes And Excitation > Flashcards

Lecture 1 - Cell Membranes And Excitation Flashcards

1
Q

Contracts when information is sent (excitable cell)

A

Muscle cell

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2
Q

Conveys electrical signals over long distances

A

Nerve excitable cell

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3
Q

Contains DNA within the cell body in a neuron

A

Nucleus

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4
Q

Contains the neuron cells nucleus

A

Cell body soma

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5
Q

Received input from other neurones to convey the message

A

5-7 dendrites

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6
Q

Nerve fibres (found within the middle of neuron)

A

Axon - short and long

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7
Q

Contact region for other cells

A

Terminal bouton synapse

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8
Q

The 1st terminal of the synapse

A

Pre anterior synapse

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9
Q

Protective covering of neurone

A

Myelin (schwann cell - PNS)

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10
Q

What is the transmembrane testing potential?

A

-70mV

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11
Q

The inside of the cell is ….. vly charged

A

Negatively

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12
Q

The outside of a cell is …..ively charged

A

Positively

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13
Q

Uses facilitated (passive) diffusion

A

Voltage gated Na+ channel

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14
Q

Uses active transport

A

Na+K+ATPase pump

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15
Q

Uses rapid kinetics

A

Na+ channel

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16
Q

Uses slow kinetics

A

ATPase pump

17
Q

What does electrogenic pump mean?

A

Net loss of one positive charge from the cytoplasm helps to maintain an electric gradient within a cell and extra cellular environment

18
Q

Enters the cell via ATPase pump

A

2xK+

19
Q

Exits cell via ATPase pump

A

3x Na+ ions, therefore causing there to be a positive charge outside of the cell because only 2X K+ ions are entering

20
Q

Synaptic/graded response

A

Local - non propagated

21
Q

Response found usually at the dendrites and cell body (EPSP & IPSP)

A

Local - non propograted

22
Q

Relies on AP

A

Propogated disturbance

23
Q

Features of propagated

A
  • does not diminish
  • all or none response (not graded)
  • constant
  • over large distances
  • threshold is -55mV

Human Physiology (5 decks)

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