What compound brings about local arteriolar vasodilation by causing relaxation of arteriolar smooth muscle in the vicinity?
a. sodium chloride
b. acetylcholine
c. nitric oxide
d. dopamine
e. endothelin
c
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The ________ is an important ridge of muscle extending horizontally around the right ventricle from the interventricular septum to the base of the anterior papillary muscle containing part of the conducting system
A) auricle B) pectinate muscle C) trabeculae carneae D) moderator band E) conus arteriosus
Answer the following questions true (T) or false (F)
1. Cross-sectional area increases as arteries branch into smaller vessels, causing the blood to flow more slowly. 2. Mean arterial pressure generally measures around 120/80 mm Hg. 3. Increase or decrease in blood oxygen concentration triggers the baroreceptor reflex, which is regulated by the medulla of the brainstem.
Which is not characteristic of the parasympathetic division of the ANS?
A. Long preganglionic axons B. Long postganglionic axons C. Terminal ganglia close to the target organ D. No rami communicantes E. Craniosacral preganglionic neuron cell bodies
Which type of antibody is formed in response to parasitic infections and allergies, and has the effect of activating mast cells and basophils?
A. IgG B. IgA C. IgE D. IgD E. IgB