At what stage of pregnancy does an embryo show a beating heart and a complete central nervous system?
a. 8 weeks b. 12 weeks
c. 20 weeks d. 29 weeks
a
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What is the usual state of nitrogen balance for healthy infants, children, and pregnant women?
a. Equilibrium b. Metabolic c. Positive d. Negative
All of the following are established relationships between diet and behavior EXCEPT:
a. severe protein-calorie malnutrition early in life is related to impaired mental development. b. sugar intake is related to over-activity and impulsiveness. c. overexposure to lead is related to poor academic performance. d. iron-deficiency anemia is related to reduced attention span.
The main function of carbohydrates in the body is to _____
a. furnish the body with energy b. provide material for synthesizing cell walls c. synthesize fat d. insulate the body to prevent heat loss e. build mitochondria
After Kenny quickly drank his first beer, he felt relaxed and sociable for a while. Soon, he had to drink three beers in an hour to obtain the same mind-altering affects. Based on this information, Kenny has developed ________ to the amount of alcohol in one or two beers.
A. impairment B. withdrawal C. tolerance D. inhibition