Question

1) Detail the complete reflex pathway involving parasympathetic signalling to the heart. Begin this at the Caronia pody baroreceptors (7 pts)

Answer 1

The reeflex Pathway involving Bareasympathetic signalling to the heart is known as BARO RECEPTOR REFLEX. SHearet receives parasympathetic input via rageus nerere Canx). When stimulated, acetylcholine binele tro My reeceptores , which deceeases the I bearet rate ( negative chreone freopic effect). In Bartoreceptore reefler, mechaos o receptores alice located at carrotial Sinus and goretič arch. It is sensitive. to stretch and defects the change in avetercial Preessure. This information is communicated to the the medulla oblongata. It triggers the autonomic reesponse riai

thetic pathway activated • If a artercial Pressure & Pareasympathetic pathway activare ls This reduces hearet rate vasodilates vessels and leads t o decrease in arctercial Preessure. • If arefercial Pressure = sympathetic pathway activales bIn creeases hearet Ratef forece of of contraction, vaso - -constrictions , leading to increase in arfercial Preessuire. ce This is the Baro receptore reflex

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