Select the two major portions of the adrenal glands.
a. hemisphere
b. cortex
c. lobule
d. lobe
e. medulla
Answer: b. cortex
e. medulla
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Based on the figure above, showing fetal (A) and adult (B) oxygen-hemoglobin saturation curves, which of the following conclusions is true?
A) The mother binds oxygen with greater affinity than the fetus. B) Adult saturation occurs at lower partial pressures of oxygen than fetal saturation does. C) At 50 percent saturation, fetal blood will have a higher affinity for oxygen than adult blood will. D) As the partial pressure of oxygen increases, adult hemoglobin approaches saturation faster than fetal hemoglobin does.
Which observations illustrate shared ancestry by anatomical comparison studies? Check all that apply.
_____ The same structure has evolved to carry out different functions. _____ Different structures evolve in similar ways when subjected to the same selective pressures. _____ A structure becomes vestigial. _____ Structures are found to be homologous.
Members of the ____ Lophotrochozoan phylum are acoelomate, dorsoventrally flattened,and do not have circulatory
or respiratory systems.
a. Rotifera b. Mollusca c. Platyhelminthes d. Annelida e. Nemertea
Bone is composed of
A) living cells that secrete a surrounding matrix. B) a hard composite of phosphate and sodium ions. C) channels containing lymphoid tissue. D) hardened cartilage.