A structure that allows the middle ear to communicate with the nasopharynx is the
A) auditory meatus.
B) eustachian tube.
C) bony labyrinth.
D) membranous labyrinth.
E) pinna.
B) eustachian tube.
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Increased activity in the cells of the dorsal respiratory group of the medullary respiratory center is expected to produce
A. increases in depth of inspiration. B. decreases in depth of inspiration. C. increases in forcible exhalation. D. increased contraction of the abdominal muscles and internal intercostals muscles. E. no change in breathing whatever.
Within a chemical synapse, the receptors
What will be an ideal response?
The major categories of hormones are
amino acid derivatives, peptide hormones, and lipid derivatives enzymes, prosthetic groups, and antioxidants growth factors, endorphins, and glycoproteins paracrine factors, proteins, lipids all of the above are correct
A vaccine is effective because ________
A) the vaccine contains the antibodies necessary to fight infection B) the vaccine contains the lymphocytes necessary to fight infection C) the secondary response of the adaptive immunity is faster and more efficient the primary response D) B-lymphocytes are unable to mount an immune response the first time they are exposed to a new pathogen