Cellular Communication

Question 1

What percentage of the body’s total body water is intracellular?

Answer 1

65%

Question 2

What percentage of the body’s total body water is extracellular?

Answer 2

30%

Question 3

What percentage of the body’s total body water is transcellular?

Answer 3

2-3%

Question 4

What percentage of the body’s total body water is interstitial?

Answer 4

25%

Question 5

What percentage of the body’s total body water is plasma?

Answer 5

8%

Question 6

What is the extracellular concentration of each of Na+ and Cl- ?

Answer 6

150mM

Question 7

What is the intracellular concentration of K+?

Answer 7

100mM

Question 8

At what voltage range are Na+v channels inactivated?

Answer 8

+35 to -90mV, delayed

Question 9

At what voltage range are Na+v channels are resting?

Answer 9

-90mV

Question 10

At what voltage range are Na+v channels are activated?

Answer 10

-90 to +35mV

Question 11

What are K2P channels activated by?

Answer 11

pH, stretch, volatile anaesthetics (TREK1),arachidonic acid

Question 12

Do Gs channels cause relaxation or contraction?

Answer 12

Contraction, via increased cAMP.

Question 13

Do Gi channels cause relaxation or contraction?

Answer 13

Relaxation, via decreased cAMP.