Male, 45 years old, normal calm breathing, tidal volume 500ml, respiratory rate 16 times/min, if the tidal volume is halved and respiratory rate doubled, what are the changes of pulmonary ventilation and alveolar ventilation respectively?()
A. Pulmonary ventilation remained unchanged and alveolar ventilation decreased
B. Pulmonary ventilation remained unchanged while alveolar ventilation increased
C. Both Pulmonary ventilation and alveolar ventilation increased
D. Both Pulmonary ventilation and alveolar ventilation decreased
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The main reason that strenuous exercise reduces urine volume is()
A. Increased vasopressin secretion
B. Increased glomerular capillary blood pressure
C. Renal arterioles contracted and renal blood flow decreased
D. Increased glomerular filtration rate
The length of time it takes to complete a reflection depends on()
A. How strong or weak the stimulus is
B. The sensitivity of the effector
C. The sensitivity of the receptors
D. Number of synapses passing through the center
The function of parathyroid hormone is to regulate
A. sodium
B. potassium
C. calcium
D. magnesium
Glucose enters the red blood cell from the extracellular fluid()
A. Simple diffusion
B. facilitated diffusion
C. active transport
D. endocytosis
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