Varicose veins can be caused by ________.
A. stiffened venous valves
B. excessive venous congestion
C. compression of abdominal aorta by a fetus during pregnancy
D. All of the choices are correct.
Answer: B
You might also like to view...
Together, the epithelium and the lamina propria of the respiratory tract constitute (a)
A) serous membrane. B) mucous membrane. C) synovial membrane. D) cutaneous membrane. E) All of the answers are correct.
If a male's testes fail to descend before birth, a condition known as cryptorchidism, what would one possible repercussion be?
A. Reduced fertility B. High androgen levels C. Abnormally high rates of spermatogenesis D. Overactive seminal vesicles
Describe the simplest type of unicellular exocrine gland
A) Simple alveolar (acinar) gland; this is found during embryonic development and not in adults. B) Simple tubular gland; this gland has a single duct that does not divide at the straight glandular cells. C) Simple coiled tubular gland; this has a single duct but a coiled secretory area. D) Goblet cell; this cell is scattered among absorptive cells in the intestines. E) Simple holocrine cell; this cell will burst to release its secretions.
Rapid removal or destruction of neurotransmitter in the synaptic cleft
A. is necessary for synaptic transmission. B. generates local potentials in the presynaptic terminal. C. may lead to action potentials. D. may stop exocytosis. E. may affect the ability of the postsynaptic membrane to generate action potentials.