Which of the following statements regarding PTH (parathyroid hormone) is true?
A. PTH causes increased Na+ reabsorption in the kidneys.
B. PTH causes increased reabsorption of Ca2+ in the kidneys.
C. PTH causes increased loss of Ca2+ from the kidneys.
D. PTH causes decreased uptake of Ca2+ from the small intestine.
E. PTH causes decreased vitamin D formation in the kidneys.
B
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Which of the following helped adapt the human skull for bipedalism compared with an ape’s skull?
A. The foramen magnum is more posterior. B. The foramen magnum is more superior. C. The face is flatter. D. There is more weight anterior to the occipital condyles.
________ are calcium-carbonate and protein granules in the inner ear that enhance the sense of gravity and motion.
Fill in the blank(s) with the appropriate word(s).
Ammonia is
A. a waste product of fatty acid metabolism. B. exhaled by the lungs into the air. C. processed by the liver to form urea, a less toxic compound. D. a waste product of fatty acid metabolism and is excreted by the kidneys into urine. E. a polypeptide containing many amino acids.
The two general types of chromosomes are
A) sex chromosomes and allosomes. B) sex chromosomes and autosomes. C) X and Y chromosomes. D) autosomes and allosomes.