Explain the proposed role of hemoglobin in the regulation of blood flow and blood pressure
What will be an ideal response
The gaseous hormone nitric oxide (NO), produced by the endothelial cells that line blood vessels, binds to hemoglobin. Under some circumstances, hemoglobin releases NO. The released NO causes vasodilation, an increase in blood vessel diameter that occurs when the smooth muscle in the vessel wall relaxes. Vasodilation improves blood flow and enhances oxygen delivery to cells near the site of NO release.
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The posterior root of a spinal nerve contains
A) axons of motor neurons. B) axons of sensory neurons. C) cell bodies of motor neurons. D) cell bodies of sensory neurons. E) interneurons.
The pressure-driven movement of fluids and solutes from blood into interstitial fluid is called
a) reabsorption. b) filtration. c) bulk flow. d) osmosis. e) transcytosis.
Which category of urinary drug promotes voiding of urine from the urinary bladder?
a. cholinergics b. anticholinergics c. sympathomimetic d. sympathetic blocking agents
The submucosal and myenteric nerve plexuses that help regulate the mobility and secretory activity of the GI tract organs are both part of the ________
A) somatic nervous system B) autonomic nervous system C) sympathetic nervous system D) fight-or-flight mechanism E) central nervous system