Which of the following description is correct about the characteristics of nerve fiber excitation conduction?()
A. only one-way conduction from cell body to terminal
B. without interference among fibers in nerve trunk
C. as long as the structure is intact, normal excitation can be conducted
D. is not affected by the changes of factors in internal environmental
E. When stimulated continuously, the conductive capacity decreases rapidly
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Among the following items, the effective glomerular filtration pressure can be reduced by()
A. increase of plasma crystal osmotic pressure
B. increase of plasma colloid osmotic pressure
C. decrease of hydrostatic pressure in renal capsule
D. increase of glomerular capillary blood pressure
E. increase of colloidal osmotic pressure in renal capsules
The effective stimulus of central chemoreceptors is ()
A. PCO2 in blood
B. PO2 in blood
C. H+ in blood
D. PCO2 in cerebrospinal fluid (CSF)
E. H+ in cerebrospinal fluid (CSF)
Which one is main source of elastic resistance of the lungs?()
A. The surface tension within the alveoli
B. The elastic recoil of the lung tissues
C. Airway resistance
D. Inertial resistance
E. Viscous resistance
The vital humoral factor regulating the production of RBC is ____.()
Androgen
B. Growth hormone
C. Thyroid hormone
D. Estrogen
Erythropoietin
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