Sensory nerve cells, parasympathetic ganglia, and sympathetic postganglionic fibers can be found in the
A) mucosa.
B) serosa.
C) adventitia.
D) submucosal neural plexus.
E) lamina propria.
D
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A relatively new theory has arisen regarding the development of twins at fertilization. In addition to the phenomena of identical and fraternal twins, the theory suggests that semi-identical twins called polar body twins can occur if fertilization occurs in the second polar body immediately after fertilization of the oocyte (different sperm fertilizing each). If this is true, what should be true about the zygotes?
A. One twin will be physically smaller than the other after birth and later in life. B. At least one of the twins will have a genetic abnormality due to the nature of the division that produces the secondary oocyte and polar body. C. The twins will have the exact same maternal genes, but their paternal genes will vary. D. The twins will possess exactly the same genetic material.
Which molecule is least likely to be able to pass through a cell membrane without help?
A) C6H12O6 B) C7H16 C) H2O D) CH4
A. detect acceleration of the head. B. amplify sound waves and transmit them to the inner ear. C. determine static head position. D. support the tympanic membrane and protect hair cells of the inner ear. E. initiate action potentials that propagate to the
A. much larger than the tympanic membrane, and the ossicles therefore amplify sound waves. B. much smaller than the tympanic membrane, and the ossicles therefore amplify sound waves. C. much larger than the tympanic membrane, and the ossicles therefore dampen sound waves. D. much smaller than the tympanic membrane, and the ossicles therefore dampen sound waves.
Which of the following would occur as a result of increased renin release by the kidneys?
A. An increase in blood volume B. A decrease in blood pressure C. A decrease in aldosterone D. An increase in urine output E. An increase in vasodilator secretion