【名词&注释】
房室传导阻滞、肘关节(elbow joint)、重要途径(important way)、三角肌(deltoid muscle)、做好事(perform good deeds)、自然而然、促胃液素(gastrin)、刺激物(irritant)、人生在世、阵发性室性心动过速(paroxysmal ventricular tachycardia)
[单选题]促进胰酶分泌的体液因素是( )
A. 促胃液素(gastrin)
B. 促胰液素
C. 胆囊收缩素
D. 抑胃肽
E. 内因子
根据以下内容,回答下面的题目。Researchers have found that REM (rapid eye movement) sleep is important to human beings.This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence.The deeper a person’s sleep becomes, the longer the periods of rapid eye movement.There are physical charges in the body to show that a person has changed from NREM (non-rapid eye movement) to REM sleep.Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly.Accompanying these physical changes in the body is a very important characteristic of REM sleep.It is during REM sleep that a person dreams.According to the passage, how often does REM sleep occur in one night?