The position of the head with respect to gravity is determined by the
A. shift in fluid in the semicircular canals.
B. movements of otoliths in response to gravity.
C. movements of perilymph in the vestibular chamber.
D. impulses transmitted from the macula of the semicircular canals.
E. stimulation of the cochlear portion of the nerve.
B
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________ is an enlargement of the thyroid gland.
A. Gigantism B. Exophthalmos C. Goiter D. Pheochromocytoma
During swallowing, all of the following occur except
A) solids are prevented from entering the respiratory tract. B) the larynx is elevated. C) the epiglottis folds over the glottis. D) the uvula rises to block the oropharynx. E) liquids are prevented from entering the respiratory tract.
The plateau of the action potential in cardiac ventricular cells results from the opening of voltage-gated long-lasting ___________ channels in the plasma membrane of the cell
A. Na+ B. K+ C. Ca2+ D. Cl- E. glucose
A display of the chromosomes of a somatic cell during metaphase of mitosis is the
A. karyotype. B. autosome. C. homolog. D. locus. E. genome.