Emission and ejaculation require all of the following except
A) sympathetic stimulation.
B) peristaltic contractions of the ampulla.
C) propulsion of semen.
D) contractions of the bulbospongiosus muscle.
E) contraction of the dartos muscles.
Answer: E
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The thin extracellular layer, consisting of the basal and reticular lamina, that anchors epithelial cells to underlying connective tissue is called the
a) basement membrane. b) tunica adventitia. c) tight junction. d) adherens junctions. e) gap junctions.
Which of the following is false concerning the allantois?
A) It derives partly from endoderm. B) It projects into the umbilical cord. C) It stores nitrogenous wastes. D) Part will develop as the urinary bladder. E) It acts as the fetal bone marrow.
The total solute concentration of a red blood cell is about 2%. Sucrose cannot pass through a red blood cell's plasma membrane, but water and urea can. Which of the following solutions will cause a red blood cell to shrink?
A) a hypertonic sucrose solution B) a hypertonic urea solution C) a hypotonic sucrose solution D) a hypotonic urea solution
The two thyroid hormones (TH) are T3 and T4. The "3" and "4" refer to number of
a. oxygen atoms. b. tyrosine amino acids. c. iron atoms. d. calcium atoms. e. iodine atoms.