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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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
The brain is in the:
a. ventral cavity b. cranial cavity c. mediastinum d. none of the above
Which of the following vitamins is necessary for producing collagen?
A) Vitamin C B) Vitamin D C) Thiamine D) Biotin
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