Which of the following changes contributes to an adolescent’s lessening susceptibility toward respiratory infections?
A. more exposure to germs because of the increase in social activity
B. shrinkage of the lymphoid system
C. increase in sex hormones
D. growth spurt
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Some teenagers seem able to skate, play basketball, or dance for hours without rest. This increased endurance is best explained by:
A. increased hormone output.
B. increases in muscle tissue.
C. better digestive processes.
D. the growth of the heart and lungs
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In adolescence, changes in heart and lung capacity include:
A. greater lung capacity.
B. increased heart rate.
C. the heart tripling in size.
D. the lungs doubling in weight
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At what age does the brain become fully mature?
A. 20
B. 25
C. 30
D. 35
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