Chyme is released from the stomach intermittently in small amounts because
A) it must be converted to a much less acidic pH before entering the duodenum.
B) moving food into the small intestine too quickly can lead to an ulcer.
C) the ileocecal valve is too small to pass it all at once.
D) the small intestine can hold only a small fraction of the stomach volume at a time.
D
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Vitamin B12 is found in:
a. whole grains. b. nuts. c. meats. d. legumes.
Which of the following is a characteristic of fuel use by muscles?
a. At rest, about 90% of the fuel is derived from glucose. b. At rest, about 90% of the fuel is derived from fat. c. Muscles always use a mixture of fuels at rest or during physical activity. d. During physical activity, amino acids contribute most of the fuel. e. During the first 10 seconds of physical activity, the lactic acid system is the predominant source of energy.
What percentage of bone loss in women has been reported to occur each year after menopause?
a. 1-3% b. 2-4% c. 3-5% d. 4-6%
In the most recent edition of Choose Your Foods: Exchange List for Diabetes, the three groups into which foods are arranged are:
a. fruits and vegetables, breads, and meats. b. fats, starches and sugars, and meat and milk. c. fruits and vegetables, meat and milk, and starches. d. carbohydrates, meat and meat substitutes, and fats.