Lecture #21 - Bioelectricity, membrane potentials (just Qs)

Question 1

What creates the membrane potential?

Answer 1

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Question 2

What does bio-electricity rely primarily on?

Answer 2

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Question 3

Is the lipid bilayer a conductor?

Answer 3

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Question 4

What creates a charge diff bw two sides of membrane? What’s this called?

Answer 4

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Question 5

Ions channels - what are they? what do they allow?

Answer 5

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Question 6

What are ion channels responsible for? Are they selective?

Answer 6

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Question 7

At RMP, which ion channels mostly closed and what about the other?

Answer 7

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Question 8

Na+/K+ ATPase (pump) - what does it shift? What does it maintain?

Answer 8

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Question 9

Concentration of ions inside vs outside cell for Na+ and K+

Answer 9

High/low

Question 10

What are channels - definition

Answer 10

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Question 11

Membrane potential of neuron varies in ___ and ___

Answer 11

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Question 12

Resting:

• what channels open?
• potential?

Answer 12

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Question 13

Na+ open:

• positive charges out or in?
• potential? called?

K+ open:

• positive charges out or in?
• what happens? (R and H)

Answer 13

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Question 14

Depolarised - excitatory or inhibitory?

Hyperpolarised - excitatory or inhibitory?

Answer 14

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Question 15

For each;

1. Polarisation
2. Typical value
3. Description

Resting
Local
Threshold
Action

Answer 15

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