The researchers also found that the total volume of the hippocampus in those in the increasing/high group was 14% lower than those in the decreasing/moderate group, although there were no differences in other brain regions.

　　The results suggest that brain again can be accelerated by levels of adrenal hormones that are not generally regarded as pathological and that variation within this normal range is related to variation in the rate of brain aging, write Porter and Landfield. This further suggests that chronic stress may accelerate the worsening of hippocampus.

　　1. The part of the brain important for a persons learning and memory is

　　A) the cortisol.

　　B) the adrenal glands.

　　C) the stress hormones.

　　D) the hippocampus.

　　2. When the levels of cortisol go higher, the hippocampus in the brain may

　　A) become larger.

　　B) become smaller.

　　C) be missing.

　　D) be totally damaged.

　　3. According to the article, when people feel too worried or nervous or when they overwork,

　　A) the adrenal glands will produce a stress hormone.

　　B) the kidneys will produce adrenal glands.

　　C) the hippocampus will produce high level of cortisol in the blood.

　　D) the cortisol will produce something that makes a poorer memory.

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