Where do B cells develop immunocompetence?
A) thymus gland
B) bone marrow
C) spleen
D) thyroid gland
E) lymph nodes
B
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The exchange vessels in the cardiovascular system are called ________.
A) veins B) arteries C) capillaries D) venules E) arterioles
At the end of meiosis II, there are
two haploid cells, with each chromosome containing two sister chromatids. two haploid cells, with each chromosome consisting of a single chromatid. four haploid cells, with each chromosome containing two sister chromatids. four haploid cells, with each chromosome consisting of a single chromatid. four diploid cells, with each chromosome consisting of a single chromatid.
As the pitch of a sound gets higher, displacements of the basilar membrane:
A. occur closer to the oval window. B. occur closer to the helicotrema. C. occur uniformly throughout the membrane. D. become greater in amplitude. E. become smaller in amplitude.
Sudden, painful involuntary contractions of either smooth or skeletal muscle are called
A. spasms. B. convulsions. C. cramps. D. sprains.