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【单选题】
Which of the following will decrease the rate of oxygen transfer between the alveolar air and the pulmonary capillary blood?（ ）
A.
Decreasing the mixed venous oxygen tension from 40 to 10 mmHg
B.
Destruction of alveolar septa and pulmonary capillaries by a disease known as alveolar emphysema
C.
Perfusing previously unperfused pulmonary capillaries
D.
None of the above
E.
Increasing PO2 in the alveoli from 100 to 500 mmHg
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【单选题】The important raw material for hemoglobin synthesis during erythropoiesis is（ ）
A.
Erythropoietin
B.
Folic acid and vitamin B12
C.
Intrinsic factor
D.
Protein and iron
E.
Androgen
【单选题】The proximal convoluted tubules reabsorb how much percentage of filtered water?（ ）
A.
40%
B.
50%
C.
25%
D.
90%
E.
65%
【单选题】When it is cold, thyroid hormone increases because of（ ）
A.
Neuro-humoral regulation
B.
Humoral regulation
C.
Feedback adjustment
D.
Self-regulation
E.
Neuromodulation
【单选题】The thermal equivalent of oxygen of food is（ ）
A.
The energy released when food is oxidized to consume 1 liter of oxygen
B.
1 gram of energy released when food is oxidized
C.
1 gram of heat produced when food is burned outside the body
D.
1 gram of energy released by food during its metabolism in the body
E.
Energy released when 1 liter of oxygen is consumed by oxidizing 1 gram of food
【单选题】When the fixator moves from far to near, the eye's regulatory response is（ ）
A.
Increased lens convexity, reduced pupil and convergence of optic axis
B.
Reduced lens convexity, reduced pupil and convergence of optic axis
C.
The convex degree of lens increases, the pupil shrinks, and the optic axis spreads
D.
Reduced lens convexity, dilated pupil and convergence of eyes
E.
Lens convexity increases, pupil dilates, and two eyes converge
【单选题】The most commonly used indicators to judge the level of tissue excitability are（ ）
A.
Peak potential
B.
Duration of stimulation
C.
Threshold intensity
D.
Rate of time-intensity change of stimulus
E.
Threshold potential
【单选题】The structure of nonchemical information transmission is（ ）
A.
the scrotum
B.
Effects of hormones on target organs
C.
Classical synapse
D.
Gap connection
E.
Nerve-muscle joint
【单选题】Stimulation of the vagus nerve may cause（ ）
A.
Enhanced gastrointestinal movement and increased secretion of digestive juices
B.
It mainly causes enhancement of gastrointestinal motility
C.
Decreased gastrointestinal movement and secretion of digestive juices
D.
Weakened gastrointestinal movement and increased secretion of digestive juices
E.
Increased gastrointestinal movement and decreased secretion of digestive juices
【单选题】The final stage of the blood coagulation process is（ ）
A.
FⅫ is activated
B.
The formation of fibrin
C.
Tissue releases FIII
D.
The formation of thrombin
E.
Formation of prothrombin activator
【单选题】Which of the following could potentially result in more low V/Q regions within the lung?（ ）
A.
Obstruction of both pulmonary arteries
B.
None of the above
C.
Doubling the ventilation to the right cranial lobe while its blood flow remains the same
D.
Vasoconstriction of the pulmonary arteries of the left lung in a cow
E.
Atelectasis of one lobe of a dog lung