The major determinant of resistance to blood flow is the:
a. percentage of red blood cells
b. blood's pH level
c. blood vessel's strength
d. blood vessel's percentage of smooth muscle
e. blood vessel's radius
e
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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.
The exchange of thermal energy between an animal and its environment can occur by
A) Conduction and convection. B) Radiation. C) Evaporation. D) All of the above
Which of the following events occurs in the secondary active transport of glucose?
A. Glucose is moved against its concentration gradient into the cell. B. The Na+-K+ pump maintains a Na+ concentration gradient across the plasma membrane. C. Na+ ions and glucose are cotransported by the same carrier molecule. D. Energy comes from diffusion of Na+ down their concentration gradient. E. All of the choices are correct.
Epinephrine, aldosterone, and antidiuretic hormone each cause an increase in blood pressure.
Answer the following statement true (T) or false (F)