3120%20Cardio%209%20Jan%202012%20for%20WebCT

carotid sinus baroreceptors are more sensitive than

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Unformatted text preview: g for the aortic nerve compared with 70 mmHg for the carotid sinus nerve. ! Carotid sinus baroreceptors are more sensitive than those in the aortic arch more sensitive receive big gush of blood, more pulsitile Baroreceptor Reflex solid line, mylinated dash linem non-mylinated SA & AV & contractile Ach mainly SA & AV node most of time constrict contrict or dilate also innervate vein, change blood volume --> inc venous return --> inc diastolic volume --> inc stroke volume --> inc cardio output --> inc MAP change stroke volume Baroreceptor Reflex Change in arterial blood pressure " Change activity of the mechanoreceptors fire more AP " Change the vagal and sympathetic outflow " " to heart and resistance and capacitance vessels Let’s look at CV centre Baroreceptor Reflex The main components of the cardiovascular center include: (a)  the solitary tract nucleus (NTS) Nucleus of Tractus Solitarius (b)  the vagal center (c)  the vasomotor center Let’s look at these structures.. Baroreceptor Reflex hypothalamus both are excitatory cerebellum inhibitory interneurons medulla excitatory 21:40 PSN down spinal cord mostly sympathetic branch post-ganglionic Baroreceptor Reflex always excitatory to NTS excitatory inhibitory interneuron to SA to AV AV & SA node & contractile cell & blood vessels Phys 3120 - Lecture Outline Baroreceptor reflex and CV control centre -  -  -  Structures ! Response to high BP Response to a fall in BP CV regulation during emotional stress CV regulation during exercise Baroreceptor Reflex Mean Arterial Pressure = CO X TPR CO = Cardiac Output TPR = total peripheral resis...
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