What causes much of the blood in the fetal right atrium to be shunted to the left atrium through the foramen ovale?
A. The blood pressure in the left atrium is greater than in the right atrium.
B. The umbilical arteries have valves.
C. The blood pressure in the right atrium is greater than in the left atrium.
D. The fetus is in an antigravity situation provided by the amnionic fluid.
E. There is a valve that directs the blood that way.
Answer: C
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What will happen if a normal cell is placed in a hypotonic solution?
A. The result can't be predicted. B. It will swell in size. C. It will stay the same size. D. It will shrink in size.
If pure water and a solution containing a nonpenetrating solute are separated by a membrane that is permeable only to water, what would occur?
A. Water will diffuse by osmosis until all of the water is on the same side as the solute. B. No movement will occur between the compartments. C. Water will diffuse by osmosis toward the side with the solute, until stopped by opposing hydrostatic pressure. D. Water will diffuse by osmosis away from the side with the solute, until stopped by hydrostatic pressure. E. Water will diffuse by osmosis until the water concentrations in the two compartments become equal.
What is the function of a cone or slide box for rodent restraint?
What will be an ideal response?
The rough endoplasmic reticulum
a. is studded with ribosomes. b. synthesizes proteins for export from the cell or for use in construction of a new cellular membrane. c. is continuous with the smooth endoplasmic reticulum. d. is connected to the nucleus. e. all of these answers.