Define vasoconstriction and vasodilation. What is the mechanism of regulation?
What will be an ideal response?
Vasoconstriction is a reduction in the lumen diameter of a blood vessel due to smooth muscle contraction. Vasodilation is a widening of the lumen due to smooth muscle relaxation. Both are regulated by vasomotor nerve fibers of the sympathetic division of the autonomic nervous system.
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Poison ivy contains a toxin that acts as a hapten by
A. raising the body's sensitivity to a wide variety of chemicals such as penicillin. B. cutting plasma protein antibodies in half. C. preventing effective immune responses by blocking release of bradykinin. D. combining with a body protein and then triggering an immune response.
In bone, rings of matrix called ________ surround a central canal that contains blood vessels
A) osteoblasts B) canaliculi C) concentric lamellae D) osteoclasts
An antibody binds to an antigen at a specific area called the
A) constant segment. B) light chain. C) antigen binding site. D) hapten. E) antigen-antibody complex.
Cytokinesis overlaps with which phase of mitosis?
A) Metaphase B) The S phase C) Prophase D) Interphase E) Telophase