Humans Phys 1.4

Question 1

What happens when the Na+ K+ ATPase stops working?

Answer 1

Na+ cannot be pumped out of the cell so water fills the cell following the Na+ and causes the cell to burst

Question 2

How is energy driven in a primary active transport?

Answer 2

Directly by ATP

Question 3

How is energy driven in secondary active transport?

Answer 3

Indirectly from the ionic concentration that was generated and maintained by active transport

Question 4

Uniport

Answer 4

Transports a single molecule

Question 5

Symport

Answer 5

Transports two different molecules in same directions

Question 6

Antiport

Answer 6

Transports two different molecules in opposite directions

Question 7

What does the Na+ K+ ATPase do?

Answer 7

Pumps 3 Na+ out of cell and 2 K+ into cell

Question 8

Why is the Na+ K+ ATPase electrogenic?

Answer 8

Because the charges being moved are not equal (it contributes to negative resting membrane potential by 10%)

Question 9

What percentage of energy is devoted to the Na+ K+ ATPase in some nerve cells?

Answer 9

60-70%

Question 10

Where does the sodium gradient come from in a secondary pump?

Answer 10

Na+ K+ ATPase (secondary only works if primary is working too)