Final Practice: 1

Question 1

Adenyl cyclase causes:
A. ATP to be produced
B. Cellular cAMP to increase
C. A G protein to activate
E. A & B

Answer 1

Cellular cAMP to increase.

Question 2

Phospho lipase C activation
A. Is caused by cAMP
B. Stimulates the production of PIP2
C. Leads to the leukotriene production
D. Increase Calmodulin
E. None of the above

Answer 2

E - none of the above.

Question 3

Which of the following is true?
A. Intracellular fluid = low K+ and high Na+
B. Intracellular fluid has overall positive charge at membrane (at resting potential)
C. Extracellular fluid is characterized by high Cl- and high K+
D. Extracellular fluid is characterized by high Na+ and high Ca+
E. None

Answer 3

Extracellular fluid = high Na and high Ca

Question 4

Depolarization is due to
A. Influx of K+
B. Efflux of Cl-
C. Influx of Na+ 
D. Efflux of Ca+
E. B and C

Answer 4

Influx of Na ONLY

Question 5

Neural summation
A. Can be depolarizing
B. Can be hyperpolarizing
C. Always results in threshold
D. A and B
E. A and C

Answer 5

A. Can be depolarizing
AND
C. Always results in threshold