When these valves open, blood goes from the atria to the ventricles
A) SA node B) SL valves C) AV valves D) AV node
Answer: C
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If you experimentally reduce the concentration of K+ in the extracellular fluid surrounding hair cells in the inner ear, the result would be like which of the following?
A) decreasing the volume of sound reaching the hair cells B) increasing the volume of sound reaching the hair cells C) decreasing the frequency of sound reaching the hair cells D) increasing the frequency of sound reaching the hair cells
Cyanide and carbon monoxide block the final step in the electron transport chain. Consequently, ATP production in the mitochondria would
A. not change, because protons cross the outer mitochondrial membrane to produce ATP. B. increase, because this would spontaneously establish a stronger proton gradient. C. decrease, because electrons would not move through the electron transport chain and reduce oxygen. D. decrease, because protons would not be able to move across the inner mitochondrial membrane. E. increase, because this would make more oxygen available in the mitochondrial matrix.
Biofuels ____
a. are a renewable source of energy b. do not produce carbon dioxide when burned
c. are made from organic remains of ancient organisms d. release energy without using oxygen e. do not damage the environment
The wings of bats and birds and the flippers of porpoises are
a. analogous structures. b. totally unrelated. c. functionally different. d. homologous structures. e. similar by chance.