What causes the repolarization of a nerve cell? A) K+ exit B) N+ exit C) N + entry D) K+ entry
A) K+ exit
The plateau phase in the cardiac action potential is due to which of the following factors? A. Na inward current B. K outward diffusion C. Ca inward and K outward diffusion D. Ca outward and K inward diffusion
C. Ca inward and K outward diffusion
In general, which subject has the highest percentage of body water?
a. A 20-year-old male
b. A 20-year-old female
c. A 40-year- old male
d. A 40-year-old female
e. A 70-year-old female
a. A 20-year-old male
How does the reduction in the energy cause intracellular edema?
a) Opening water channel
b) Opening Na+ channel
c) Increase facilitated diffusion of glucose into the cell
d) Na /k ATPase activity decrease
d) Na /k ATPase activity decrease
A large nerve cell show resting membrane potential of -90mv what is responsible for the majority of this membrane potential?
a) K gradient
b) Cl gradient
c) Ca gradient
d) Na gradient
a) K gradient
What is an important characteristic of facilitated diffusion?
A- carrier-mediated
B- against concentration gradient
A- carrier-mediated
[Solution X: 250 ml of 0.9% NaCl + 500 ml of 3% NaCl]
According to Van hoffs, what is the osmotic pressure of a solution X with a semipermeable membrane, having pure water on the other side?
no answer
What is the function of Clarithn?
a. Endocytosis of vesicles
b. Cytoskeleton
c. Regulation of cell membrane
a. Endocytosis of vesicles
Which solution is hypotonic? (MW NaCl=58.5, glucose=180) A. 1 liter 0.9% NaCl B. 1 liter 0.9% NaCl + 100 ml water C. 200 g of glucose in 500 ml water D. 50 g of glucose in 500 ml water E. 0.9% NaCl in 200 ml + 5 g NaCl
B. 1 liter 0.9% NaCl + 100 ml water
Substance passes from interspace to extracellular compartment by: A- Gated channels B - Endocytosis C - Transcytosis D - Exocytosis E - Pinocytosis
C - Transcytosis
What causes extracellular edema?
A. Decreased in capillary hydrostatic pressure
B. Decreased in tissue collid osmotic pressure
C. Decreased in plasma collid osmotic pressure
D. Increase in lymph flow
C. Decreased in plasma collid osmotic pressure
If H+ peptide depends on Na/H Exchanger which depend on Na/Ka ATpase. Which type is for transporting The peptide?
a. primary active transport
b. secondary active transport
c. tertiary active transport
c. tertiary active transport
If blood pressure decreases and baroreceptors sense this change and transmit signal to cardiovascular center in the brain, which sends signals to heart to decrease the heart rate... Which role in homeostatic mechanism does the heart play? A -effector B -integrating center C -afferent pathway D -efferent pathway E -sensor
A -effector
Opening of which channel increases heart rate?
A) Fast sodium channels
B) Slow calcium voltage-gated ion channels
C) Acetylcholine regulated potassium channels
B) Slow calcium voltage-gated ion channels
