Fast muscle fibers can develop a larger number of mitochondria in response to
A) repeated, exhaustive stimulation
B) sustained low levels of muscle a activity
C) high amounts of oxygen
D) increased levels of testosterone
E) prolonged periods of inactivity
A) repeated, exhaustive stimulation
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Each side of the spinal cord gives rise to ________ cervical nerves.
A. twelve B. eight C. two D. seven E. six
The carotid bodies contain ________ chemoreceptors that respond to changes in ________.
A. peripheral; concentrations of carbon, dust, and pollution in the lungs B. central; blood concentrations of H+, but not CO2 and O2 C. peripheral; cerebrospinal fluid concentrations of H+ D. peripheral; blood concentrations of H+ and O2 E. central; cerebrospinal concentrations of CO2
The pulmonary veins carry blood to the
A) heart. B) lungs. C) brain. D) intestines. E) liver.