The absorptive effectiveness of the small intestine is enhanced by increasing the surface area of the mucosal lining. Which of the following accomplish this task?
A) the vast array of digestive enzymes
B) the rugae and haustra
C) villi, and microvilli
D) Brunner's glands and Peyer Patches
C
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Which of the following vitamins is necessary for producing collagen?
A) Vitamin C B) Vitamin D C) Thiamine D) Biotin
The brain is in the:
a. ventral cavity b. cranial cavity c. mediastinum d. none of the above
A decrease in blood Na+ levels stimulates the release of the hormone aldosterone from the adrenal cortex. This is an example of ________ control.
A. tropic B. humoral C. hormonal D. nervous
The humoral control of hormone release may be triggered which of the following factors?
A) blood level of an ion like calcium B) blood level of a pituitary hormone C) blood level of a hypothalamic hormone D) nervous stimuli E) neurotransmitter activation