You observe a small, nonpolar molecule near a membrane. How would this molecule likely transport across the membrane?
A)transport across the membrane?
B)active transport
C)channel-mediated facilitated diffusion
D)carrier-mediated facilitated diffusion
E)simple diffusion
E)simple diffusion
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In the ovary, follicle, or granulosa cells secrete _____, while after ovulation the corpus luteum secretes _____.
a. estradiol; progesterone b. estradiol and progesterone; estradiol c. estradiol; estradiol and progesterone d. progesterone; estradiol e. progesterone; estradiol and estrone
Which of the choices below is the salt level-monitoring part of the nephron?
A) macula densa B) principal cell C) vasa recta D) loop of Henle
The most common blood type is
A) type A. B) type B. C) type AB. D) type O. E) type AO.
The sensation of thirst results from
A. stimulation of baroreceptors. B. a decrease in the osmolality of the extracellular fluid. C. hypertension (increased blood pressure). D. stimulation of osmoreceptor cells in the hypothalamus. E. an increase in the plasma volume.