What determines whether a person has type A, B, or O blood?
A. Antibodies in blood plasma that react against foreign red blood cells
B. Antibody receptors on the surface of red blood cells
C. Variant structures of hemoglobin within red blood cells
D. The presence or absence of spectrin in plasma membranes of red blood cells
E. Glycolipids that act as antigens on the surface of red blood cells
Answer: E
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Which of the following is incorrect pertaining to the sacral plexus?
A) It is located on the posterolateral wall of the lesser pelvis. B) It is related to the anterior surface of the piriformis muscle. C) It is joined by the lumbosacral trunk. D) It may be compressed during parturition, resulting in lower limb pain. E) Most of its branches exit the pelvis through the lesser sciatic foramen.
All hormones
a. are regulated by the hypothalamus. b. initiate synthesis of new proteins. c. are secreted by endocrine glands through ducts into the blood. d. must combine with specific receptors on the target cells in order to exert their effects. e. are produced in a gland and target cells in different tissues.
What is the function of the cremaster muscle?
A. It becomes engorged with blood during an erection. B. It contracts during ejaculation to assist in the movement of sperm through the spermatic cord. C. In most mammals, it serves to move the tail but has no purpose in humans. D. It contributes to voluntary control of urination. E. It contracts to draw the testes close to the body for warmth.
Molecules that have properties of both polar and nonpolar molecules are called
A. hydrophobic. B. hydrophilic. C. amphipathic. D. unipolar. E. bipolar.