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
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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
Tidal volume is 450 ml , respiration rate is 14/ min, then the ventilation volume is()
A. 3000ml
B. 3800ml
C. 4500ml
D. 5400ml
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