Which of the following statements concerning secretin is correct?
A. The most potent stimulus for secretin secretion is the presence of fat in the duodenum.
B. Secretin is the most potent stimulus for pancreatic digestive enzyme secretion.
C. Secretin is the most potent stimulus for pancreatic HCO3- secretion.
D. Secretin stimulates secretion by the parietal and chief cells.
E. Secretin stimulates gastrin secretion by parietal cells.
C
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The vestibular complex includes the
A) cochlea and organ of Corti. B) cochlea and tympanic membrane. C) vestibule and semicircular canals. D) vestibule and cochlea. E) auditory ossicles and oval window.
When adenylyl cyclase is activated,
A) cAMP is formed. B) protein kinases are metabolized. C) calcium ions are released from intracellular stores. D) steroids are produced. E) cAMP is broken down.
The following steps occur in rods when they are excited by photons of light
1. Ganglia cells detect changes in bipolar cell activity. 2. Neurotransmitter release changes. 3. Retinal changes to a more linear form. 4. Rhodopsin breaks down (bleaches). 5. Opsin changes the membrane permeability of the outer segment to Na+. 6. Opsin activation occurs. What is the proper sequence for these steps? A) 1, 6, 5, 2, 4, 3 B) 3, 6, 5, 2, 1, 4 C) 6, 3, 5, 2, 1, 4 D) 3, 6, 5, 1, 2, 4 E) 1, 3, 4, 5, 6, 2
Incontinence is often the final outcome of the urinary system during the aging process
Indicate whether the statement is true or false