In comparing a trained athlete to a non-athlete, which of these comparisons is false?
A) The athlete has a lower resting heart rate.
B) Both hearts weigh about the same.
C) The athlete has a higher resting stroke volume.
D) The athlete has a higher exercise stroke volume.
E) The athlete has a higher exercise cardiac output.
Answer: B
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The lens of the eye flattens when
A. extrinsic eye muscles contract. B. intrinsic muscles of the iris contract. C. extrinsic eye muscles relax. D. ciliary muscles contract. E. ciliary muscles relax.
A product of the metabolism of certain nucleic acid bases is
A) urea. B) ammonia. C) water. D) uric acid.
Blood enters the right atrium from the:
A) left and right pulmonary veins B) left and right pulmonary arteries C) superior and inferior vena cavae, and the coronary sinus D) ascending aorta
A brush border of microvilli, specialized for the active transport of small molecules across trans-porter proteins in the cell membrane, is typically found in which type of epithelium?
a. Pseudostratified columnar epithelium b. Simple columnar epithelium c. Simple squamous epithelium d. Stratified squamous epithelium e. Transitional epithelium