Nitric oxide released by endothelial cells in vascular smooth muscle is responsible for smooth muscle relaxation, and therefore responsible for ________.

A. penile erection
B. increased blood flow to the fetus
C. reduced blood flow to bronchioles
D. increased blood flow in placenta


Answer: A

Anatomy & Physiology

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Which of the following represents a logical sequence of structures that contribute to the return of fluid into the blood via the lymphatic system?

A. Blood capillaries, arteries, lymphatic vessels, subclavian vein B. Arteries, lymphatic vessels, blood capillaries, subclavian vein C. Arteries, blood capillaries, lymphatic vessels, subclavian vein D. Subclavian vein, arteries, blood capillaries, lymphatic vessels

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A mutation involving a single nucleotide is a _____ mutation

A. deletion B. duplication C. nondisjunction D. point E. aneuploidy

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