Within the red pulp of the spleen are enlarged capillaries called ________, which have a discontinuous basal lamina that allows blood cells to enter and exit easily.
A. trabecular vessels
B. splenic sinusoids
C. trabecular cords
D. splenic cords
E. splenic vessels
Answer: B
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An IPSP is inhibitory because it
A. depolarizes the postsynaptic membrane. B. prevents Ca2+ entry into the presynaptic terminal. C. reduces the amount of neurotransmitter released by the presynaptic terminal. D. changes the threshold of the neuron. E. hyperpolarizes the postsynaptic membrane.
Coding regions of DNA are called _____________.
A)Exons B)Introns C)Templates D)Triplets
How many chambers make up the human heart?
A) 2 B) 3 C) 4 D) 5
Several research groups are working on vaccines that will be effective against the AIDS virus. When a successful vaccine is produced, it is likely to be injected to produce
A. active natural immunity. B. active artificial immunity. C. passive natural immunity. D. passive artificial immunity. E. active passive immunity.