Which of the following is an example of a permissive effect of a hormone?
a. the effect of thyroid hormones on growth.
b. the effect of insulin on glucose uptake by cells.
c. the effect of sex hormones on the secretion of growth hormone
d. a and c
e. all of the above
Answer: a. the effect of thyroid hormones on growth.
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The waste product bilirubin is produced from
A) globin chains of hemoglobin. B) heme molecules plus iron. C) heme molecules lacking iron. D) iron found in hemoglobin molecules. E) abnormal proteins found in red blood cells.
How does the relationship between surface area and volume impact how large a cell can be?
A. Volume is proportional to the cube of the diameter of the cell, so if diameter increases, volume will increase much faster than surface area, limiting exchange of wastes and nutrients. B. Volume and surface area both increase the same amount if the diameter of the cell increases. C. Surface area increases proportionately more than volume as the diameter of the cell increases and, therefore, exchange of wastes and nutrients is more efficient in a large cell. D. If the diameter of the cell doubles, the volume of the cell will increase by a factor of four. E. If the diameter of the cell doubles, the volume of the cell will also double.
A "widow's hump" or "dowager's hump" is an exaggerated thoracic curvature that is technically called __________.
Fill in the blank(s) with the appropriate word(s).
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