In normal circumstances, however, the SCN reacts to the lengthening nights by instructing the brain's pineal gland to secrete more of the hormone called melatonin.
然而，在正常情况下，SCN对夜晚延长的反应是，它会指示大脑的松果腺增加褪黑激素的分泌。
Melatonin, a hormone produced by the pineal gland in response to darkness, is thought to play a primary role in controlling the body's circadian rhythm.
褪黑激素，黑暗时松果腺产生的一种激素，被认为在控制身体昼夜节律起主要作用。
Melatonin is an important hormone synthesized and secreted by the pineal gland.
褪黑素是人体脑内松果腺合成与分泌的一种重要激素。
Melatonin is an important hormone synthesized and secreted by the pineal gland.
褪黑素是人体脑内松果腺合成与分泌的一种重要激素。
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