Which of the following associations is correct? A) baroreceptors-sensitivity to

Question

Which of the following associations is correct? A) baroreceptors-sensitivity to dissolved gas concentrations B) acetylcholine-muscarinic receptors on nodal cells and contractile cells C) parasympathetic nervous system-cardiac nerves D) norepinephrine-alpha receptors on nodal cells and contractile cells E) sympathetic nervous system-vagus nerves The ____ carries blood to and from the gas exchange surfaces of the lungs. A)arterial circle of Willis B) pulmonary circuit C) infundibular circuit D) systemic circuit E) hepatic portal circuit The exchange vessels in the cardiovascular system are called ____. A) veins B) arteries C) capillaries D) venules E) arterioles

Explanation / Answer

Ans 38) Acetylcholine – muscarinic receptors on nodal cells and contractile cells.

Muscurinic receptors are located post synaptically at parasympathetic neuroeffector junction which decrease or increase the activity of effector cells. The cholinergic receptors mediate action of acetylcholine and the receptors are sensitive to muscarine, hence the receptors present on nodal cells and contractile cells.

Ans 39) Pulmonary Circuit

The circuit begins and ends both at heart and carries blood to lungs to get oxygenated and then is circulated back to heart to the body.

Ans 40) Capillaries

They are microscopic, thin walled vessels which connect the smallest of the arteries to the smallest of the veins and has single cell layer in wall. Since, it is the connecting point between arteries and veins, it is called exchange vessel of cardiovascular system.

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