Which is not correct regarding the pancreas?
A. It does not begin to secrete its hormones until puberty.
B. The majority of cells in the pancreas are pancreatic acini.
C. It is located posterior to the stomach, between the small intestine and the spleen.
D. It is elongated in shape, spongy, and nodular.
E. It is a heterocrine, or mixed, gland.
Answer: A
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Which type of muscle tissue is autorhythmic?
A. Smooth muscle B. Skeletal muscle C. Both cardiac and smooth muscle are correct. D. Cardiac muscle E. Both skeletal and cardiac muscle are correct.
A cell is surrounded by an extremely thin, flexible membrane. Why is the membrane selectively permeable?
A. It allows all substances to pass through, making it easier to absorb nutrients. B. It allows all organic substances to pass through, but excludes all inorganic substances that could be harmful. C. It does not allow any substances to pass through as they could damage the cell. D. It allows some substances to pass through and excludes others based on size, polarity, and other factors.
What are three mechanisms used to regulate the timing and amount of pituitary secretion?
a) feedback from target organs b) parasympathetic nervous system control c) hypothalamus control d) sympathetic nervous system control e) control by brain centers other than hypothalamus
Which of the following is greater during left ventricular systole?
A) the peak pressure in the ventricle B) the peak pressure in the aorta C) Neither is greater.