Membrane Transport 1

Question 1

True or False:

Ion channels respond to physical and chemical changes in their environment and undergo precisely timed conformational changes.

Answer 1

True

Question 2

What are the 3 types of ion channels?

Answer 2

Voltage-gated - respond to change in membrane potential.

Chemically-gated -> respond to ligands such as neurotransmitters.

Mechanically-gated -> respond to mechanical stimuli, found in sensory neurons (detect vibration, pressure, stretch, touch, sounds, tastes, smell, heat, volume, and vision).

Question 3

What stimuli do voltage-gated ion channels respond to?

Answer 3

Voltage-gated ion channels respond to change in membrane potential.

Question 4

How much faster does ion channels transport ions than do pumps transport ions?

Answer 4

Ion channels transport ions 1000x faster than pumps.