The countercurrent multiplier system
A. is found in the collecting duct.
B. is assisted by hormones.
C. has fluid flowing in parallel tubes in opposite directions.
D. maintains the solute concentration of the medullary interstitial fluid.
E. has fluid flowing in parallel tubes in opposite directions and maintains the solute concentration of the medullary interstitial fluid.
E
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Which of the following evolutionary adaptations would result in an increase in the speed of conduction of action potentials by increasing the membrane resistance of the axon?
a. increasing the number of channels in the plasma membrane b. myelinating the axon c. increasing the diameter of the axon d. placing all voltage-gated ion channels at distant intervals e. decreasing the number of channels in the membrane.
The process of respiration that moves air into and out of the lungs is:
A) gas transport. B) tissue gas exchange. C) pulmonary ventilation. D) pulmonary gas exchange.
The DCT secretes hydrogen ions in exchange for sodium ions by the process of
A) diffusion. B) facilitated diffusion. C) osmosis. D) cotransport. E) energy-dependent exchange pump.
The center cavity of the diaphysis of a long bone is called the ________
A) nutrient foramen B) epiphysis C) canaliculus D) marrow cavity E) central canal