The most important physiological factor of regulating respiratory movement is ()
A. CO2
B. O2
C. H+
D. 2,3-DPG
E. CO
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the largest and most complex endocrine organ in human body is ()
A. Thyroid gland
B. Hypophysis
C. Hypothalamus
D. Gonad
E. Digestive tract
Secretion of which of the following substances is inhibited by low pH? ()
A. Secretin
B. Gastrin
Cholecystokinin (CCK)
D. Vasoactive intestinal peptide (VIP)
E. Gastric inhibitory peptide (GIP)
The function of gastric mucosal barrier is ()
A. Prevent pepsin from digesting gastric mucosa
B. Prevent Cl- from invading mucosa from gastric cavity
C. Prevent the diffusion of calcium from mucosa to gastrointestinal tract
D. Prevent H+ gastric cavity from invading mucosa
E. Prevent the spread of Na+ from mucosa to gastrointestinal tract
The characteristics of gastric secretion in the cephalic phase are ()
A. High acidity, especially low pepsin content
B. Low acidity, especially high pepsin content
C. High acidity and stomach protein content
D. Low acidity and pepsin content
E. Low secretion and low digestion
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