What happens when a round cell expands in diameter?
a. Its surface area and diameter increase with the cube of its diameter.
b. Its surface area and diameter increase with the square of its diameter.
c. Its volume increases faster than its surface area does.
d. Its surface area increases faster than its volume does.
e. Its volume and surface area expand by the same proportion.
c
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Osmoregulation is best defined as:
A. the control of osmotic pressure through regulation of water and solute levels. B. the movement of water from areas of lower solute concentration to areas of higher solute concentration. C. the difference in solute concentration on the two sides of a membrane. D. the movement of water through aquaporins. E. the regulation of membrane permeability.
Antidiuretic hormone promotes water conservation by increasing the levels of ______ in the collecting ducts of the kidney.
A. aquaporins B. G-protein coupled receptors C. vasopressin D. Na+/K+ ATPase E. Na+/glucose symporters
The most common cause of low sperm count in males is _____
a. varicocele b. undescended testicles c. testicular failure d. semen disorders e. obstructions
How does a calorie (lower case c) differ from a Calorie (upper case C)?
a. One calorie = 100 Calories. b. One calorie = 1000 Calories. c. One Calorie = 100 calories. d. One Calorie = 1000 calories. e. They are the same.