The mechanism of increased PaCO2 to stimulate respiratory center is mainly due to（）
A. CO2 directly stimulates the central chemoreceptor in the medulla oblongata
B. CO2 increases H+ concentration in cerebrospinal fluid, which stimulates the central chemoreceptor in the medulla oblongata
C. H+ stimulates chemoreceptor of the carotid body
D. CO2 stimulates chemoreceptor of the carotid body
E. CO2 stimulates chemoreceptor of the aortic body
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Patients with hypokalemia may appear（）
Abnormal acid urine
B. Abnormal alkaline urine
C. Neutral urine
D. Metabolic acidosis
E. Respiratory acidosis
The correct description of edema is（）
A. Hypernatremia fluid excess
B. Hyponatremia fluid excess
C. Excess fluid accumulates in the cell
D. Excess fluid accumulates in the blood vessels
Excess fluid accumulates in interstitial space or body cavities
The effect of hypotonic dehydration on patients does not include（）
A. Thirst
B. Dehydration sign
C. Reduction of blood volume
Decreased ADH secretion
E. Cell swelling
Which of the following conditions can be considered as a brain death（）
A. Whole brain functions are permanently lost
B. Pulse is undetectable
C. Heartbeat and breathing are stopped
D. Functions of cerebrum are stopped
E. Limbs are cold and blood pressure is undetectable
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