Lymphocytes that attack foreign cells or body cells infected with viruses are ________.
A) suppressor T cells.
B) B lymphocytes.
C) plasma cells.
D) cytotoxic T cells.
E) helper T cells.
D) cytotoxic T cells.
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What is the role of vitamin A in bone deposition?
A. It provides the raw material for calcification of the ground substance. B. It promotes the cross-linking of collagen molecules. C. It is necessary for calcium absorption by the small intestine. D. It promotes the synthesis of bone matrix glycosaminoglycans (GAGs). E. It stimulates osteoblast activity.
An illness causes Doug to experience severe diarrhea and an accompanying loss of bicarbonate-rich secretions. How can this metabolic acidosis be compensated?
A) increased respiratory rate and depth B) increased renin secretion C) hypoventilation D) enhanced sodium ion loss in urine
Serum is not identical in composition to plasma
Indicate whether the statement is true or false
A 42-year-old man has a vasectomy. The physician explains to him that 3 to 4 months after the procedure, when he has an orgasm during sexual intercourse, most likely he will
A. no longer produce an ejaculate B. still produce an ejaculate and the ejaculate will contain sperm C. still produce an ejaculate but the ejaculate will not contain sperm