The active form of vitamin D, which is synthesized in the kidney and plays an important role in normal calcium metabolism, is ________.
Fill in the blank(s) with the appropriate word(s).
calcitriol
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An element with 11 neutrons, 11 protons, and 11 electrons would have a mass number of ________.
11 33 22 21
Defensins and lysosomes are both part of ________ immunity and function as ________.
A. adaptive; attackers of pathogenic cells B. innate; physical barriers to pathogen entry C. innate; attackers of pathogenic cells D. adaptive; physical barriers to pathogen entry
This hormone is important in sodium regulation and therefore water balance.
A. aldosterone B. ADH C. cortisone D. glucagon
A blow to the shoulder often breaks the clavicle, but very seldom breaks the scapula. Suggest why
A. The scapula is larger than the clavicle. B. The clavicle provides the only bony attachment of the pectoral girdle to the body. C. The scapula is more protected by muscle. D. When the body is moving forward, the clavicle is more likely to be struck than the scapula. E. All of these are valid explanations.