Which of the following functions is the "sloshing" motion that thoroughly mixes chyme with the chemical secretions in the small intestine?
A) absorption
B) pendular movement
C) segmentation
D) peristalsis
C
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Researchers are conducting a study to determine the effects of vitamin C on the human immune system. The study involves providing pills that contain vitamin C to one group of human subjects and pills that do not contain vitamin C or other active ingredients to another group of people. The pills that do not contain the vitamin are
A. antidotes. B. probiotics. C. supplements. D. placebos.
What type of exercise should Laura do in order to achieve cardiovascular fitness?
a. Swimming b. Weight training c. Yoga d. Stretching
In order to reduce the incidence of neural tube defects, the FDA has mandated that folic acid be added to ____
a. grain products b. milk and dairy foods c. frozen and canned vegetables d. ground beef e. fruit juices
Compared to toddlers and preschoolers, iron deficiency is more prevalent among school-age children.
a. true b. false