The most common solvent in the body, in which solutes or other substances will dissolve, is:
A. blood.
B. water.
C. plasma.
D. bile.
Answer: B. water.
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Water and dissolved substances leave the arteriole end of a capillary due to ________, and enter the venule end of a capillary due to ________.
A. osmotic pressure being higher than hydrostatic pressure; hydrostatic pressure being higher than osmotic pressure B. osmosis; active transport C. hydrostatic pressure being higher than osmotic pressure; osmotic pressure being higher than hydrostatic pressure D. hydrostatic pressure being higher than osmotic pressure; active transport being greater than osmotic pressure
One division of the autonomic nervous system stimulates your salivary glands to secrete a watery solution of enzymes, and the other division stimulates them to secrete mucus. Together, these secretions constitute the saliva. This is an example of which of the following?
A. A dual effect B. A sympathetic effect C. An antagonistic effect D. A cooperative effect E. A biofeedback effect
Why is oxygen able to diffuse out of the bloodstream and into the peripheral tissues passively?
A) Oxygen has the unique ability to diffuse in or out of any tissue at any time. B) The plasma has higher quantities of dissolved proteins. C) There is a lower concentration of oxygen in the tissues than in the bloodstream. D) There is a higher concentration of oxygen in the tissues than in the bloodstream. E) None of the answers are correct.
Choose the correct statement regarding semen.
A) Semen contains glandular secretions with a distinct ionic and nutrient composition. B) Seminal fluid contains a prostatic enzyme, which functions in liquefying clotted semen. C) Of the total volume of seminal fluid, the prostate contributes about 60 percent. D) Seminal fluid contains an abundant amount of a waxy material called smegma. E) A normal sperm count ranges from 5 million to 15 million spermatozoa per milliliter of semen.