Voltage Dependent Membrane Permeability

Question 1

What is the average resting membrane potential

Answer 1

-40 to -90

Question 2

What does default conditions mean in resting membrane potential

Answer 2

Ions flow across membrane when a neuron is not stimulated or signaling

Question 3

Why is membrane potential informative

Answer 3

Changed in membrane potential can…
1) allow neurons to encode and transmit information
2) when v max changed behavior of neurons changed
3) events that alter default flow of ions across neuronal membrane change value if v max which affects neurons behavior

Question 4

How does reception of sensory stimulus change v max?

Answer 4

Specific receptors in sense organs respond to sensory stimulus by altering the flow of ions across membrane

Question 5

What are the different sensory stimulus receptors

Answer 5

Photoreceptors: I’m Retina and absorb light

Cilia on hair: in cochlea bend in response to vibration

Olfactory receptors: bind to odorants

Taste cells: in taste buds bind to tastants

Mechanoreceptors/ thermoreceptors: in skin respond to vibration, pressure and heat

Question 6

What is receptor potential

Answer 6

The altering of the v max resulting from reception of a sensory stimulus