The oxygen dissociation curve shifts from the normal position to the left, which of the following can be seen ()
A. Increased tissue metabolism
B. Anemia
C. The amount of oxygen entering the tissue from the blood increases
D. Store blood for weeks
E. It indicates that the oxygen content of blood decreases at a certain oxygen partial pressure
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In normal condition, the effective stimulation which may keep the respiratory center in-excitement is ()
A. afferent impulse from pulmonary stretch receptor
B. afferent impulse from proprioceptors in respiratory muscle
C. hypoxia in certain level
D. CO2 in certain concentration
E. CO2 in high concentration
The most important physiological factor of regulating respiratory movement is ()
A. CO2
B. O2
C. H+
D. 2,3-DPG
E. CO
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)
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