Muscular force can be adjusted to match increased loads by
A) increasing the frequency of action potentials in motor neurons.
B) recruiting smaller motor units.
C) recruiting fewer motor units.
D) decreasing the frequency of action potentials in motor neurons.
E) None of the answers is correct.
Answer: A
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The enzyme that harnesses the energy of H+ diffusion down its concentration gradient within a mitochondrion to make high-energy molecules for the cell is
A. pyruvate decarboxylase. B. succinic dehydrogenase. C. creatine phosphatase. D. ATP phosphatase. E. ATP synthase.
If someone were to decrease their food intake and increase aerobic exercise, they might lose adipose tissue and condition their muscles. These changes would also influence their blood vessels, as there would be
A. regression of blood vessels in adipose tissue and angiogenesis in skeletal muscle. B. angiogenesis in both adipose tissue and skeletal muscle. C. regression of blood vessels in both adipose tissue and skeletal muscle. D. angiogenesis in adipose tissue and regression of blood vessels in skeletal muscle. E. changes in the diameter of blood vessels, but no angiogenesis nor regression.
The thalamus plays a major role in controlling secretions from the pituitary gland
a. True b. False Indicate whether the statement is true or false
In an aqueous solution, sodium ions would move toward
A) a negative terminal. B) a positive terminal. C) a pH terminal. D) an organic terminal. E) the bottom.