The act of nursing stimulates the contraction of smooth muscle cells in the breast. If a newborn infant is unable to nurse, then
A. progesterone secretion is not inhibited.
B. milk is not produced.
C. oxytocin is not secreted.
D. prolactin is not secreted.
E. prostaglandins are not secreted.
C. oxytocin is not secreted.
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Which of the boxes marked 1-4 correspond to plants with dark leaves?
A) 1 only B) 1 and 2 C) 2 and 3 D) 4 only E) 1, 2, and 3
In order for B cells to produce antibodies and cytotoxic T cells to attack infected host cells, they must first
A. be activated by interleukins, encounter an antigen, and then develop specificity toward it. B. recognize self markers, develop specificity for the markers, and then produce clones. C. encounter an antigen, develop specificity for that antigen, and then remember the antigen. D. undergo maturation, encounter their specific antigen target, and then become activated through cytokines.
Light touch is detected by
a. Pacinian corpuscles. b. Meissner's corpuscles. c. Merkel's discs. d. Ruffini endings. e. free nerve endings.
The small intestine is longer than the large intestine.
Answer the following statement true (T) or false (F)