Which process of respiration relies on partial pressure gradients to move air in and out of the lungs?
A) both pulmonary gas exchange and tissue gas exchange
B) gas transport
C) pulmonary ventilation
D) both gas transport and pulmonary ventilation
Answer: C
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Each of the following effects is associated with the action of postganglionic sympathetic fibers except
A) increased sweat secretion. B) reduced circulation to the skin. C) decreased heart rate. D) dilation of the pupils. E) increased blood flow to skeletal muscles.
For air to flow into or out of the lungs, there must be
A. a volume gradient established between the atmosphere and the alveoli. B. a temperature gradient between the atmosphere and the alveoli. C. a diffusion gradient between the atmosphere and the alveoli. D. a pressure gradient established between the atmosphere and the alveoli. E. None of the choices are correct.
Activation of the complement cascade via the alternative pathway involves the spontaneous activation of the complement protein ________.
A. C5 B. C3 C. C1 D. C4 E. C2
The greatest concentration of cones is in the fovea centralis of the retina
Indicate whether the statement is true or false.