Circulation is vital because it
A) delivers carbon dioxide to tissues and removes excess oxygen.
B) supplies oxygen and nutrients to and removes wastes from tissues.
C) inflates the lungs.
D) delivers wastes to tissues.
B
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Which of the following would not be considered a mutagen?
A. Ethidium bromide, a chemical that binds directly to DNA and deforms the double helix B. Flavonoids, a family of compounds which can remove free radicals from cells C. X-rays, which can break the bonds in DNA molecules D. Nitrous acid, which can convert cytosine to uracil
The pyramids on the ventral surface of the medulla oblongata are formed by fibers of the ________ tracts
A) corticospinal B) corticobulbar C) reticulospinal D) vestibulospinal E) tectospinal
Which motility sweeps digestive remnants toward the colon between meals?
a. segmentation b. haustral contraction c. pacemaker potentials d. migrating motility complex e. mass movements
A bone cell that secretes the organic components of bone matrix is ________.
A) stimulated by activity of the thyroid gland B) an osteoclast C) an osteoblast D) an osteocyte E) located in a lacuna