Lecture 5 - Active Transport and Membrane Potentials

Question 1

When is active transport required?

Answer 1

When the cell needs to move against their electrochemical gradient

Question 2

What transporter is Na+/K+-ATPase an example of?

Answer 2

Primary Active Transporter

Question 3

What does Na+/K+-ATPase transport?

Answer 3

The Na+/K+-ATPase transports 3Na+ out of the cell and 2K+ into the cell against their natural gradients.

Question 4

What does ouabain inhibit?

Answer 4

Na+/K+-ATPase

Question 5

What is secondary active transport?

Answer 5

Secondary active transport is active transport that uses the downhill movement of one solute to drive the uphill movement of a second solute

Question 6

What are our types of secondary active transporters?

Answer 6

Cotransporters (symporters) and counter-transport/exchangers (antiporters)

Question 7

What powers cotransporters?

Answer 7

Cotransporters use the gradient of a solute to move a different solute in the same direction

Question 8

What powers counter-transporters?

Answer 8

Countertransport use the gradient of a solute to move a different solute in the opposite direction.

Question 9

What is an electrochemical gradient?

Answer 9

An electrochemical gradient is the combination of electrical and chemical potentials to measure the driving force on a charge solute