A couple want to have sexual intercourse, and they do not wish to use a behavior method as a form of birth control since they know it comes with high risk. What could be an alternative method?
A) abstinence B) withdrawal C) rhythm method D) condoms
Answer: D
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Because of the presence of both activation and inactivation gates, voltage-gated Na+ channels can
a. be closed but capable of opening. b. activated. c. closed and not capable of opening. d. all of these answers. e. none of these answers.
Most of the reabsorption of filtered calcium is unregulated and occurs in the ________, but an additional amount can be reabsorbed in the ________, depending on the plasma concentration of parathyroid hormone.
A. proximal convoluted tubule; descending loop of Henle B. distal convoluted tubule; medullary collecting ducts C. distal convoluted tubule; renal corpuscle D. distal convoluted tubule; proximal convoluted tubule E. proximal convoluted tubule; distal convoluted tubule
The eye structure that transmits and refracts incoming light is the
A. ciliary body. B. conjunctiva. C. cornea. D. pupil. E. iris.
Triglycerides and steroids are both examples of
A. essential amino acids. B. carbohydrates. C. nonessential amino acids. D. proteins. E. lipids.