rest of body Carotid sinus baroreceptor Common carotid arteries Blood to brain

Rest of body carotid sinus baroreceptor common

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rest of body) Carotid sinus baroreceptor Common carotid arteries (Blood to brain) Neural signals to cardiovascular control center in medulla Aortic arch baroreceptor Arterial Baroreceptors
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80 Firing rate in afferent neuron arising from carotid sinus baroreceptor Arterial pressure (mm Hg) Decreased Increased Normal 120 Time Mean pressure Firing rate of baroreceptor sensory neuron is directly related to magnitude of blood pressure
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Cardiovascular control center 5 components of the reflex arc?
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Blood pressure decreased toward normal When blood pressure becomes elevated above normal Carotid sinus and aortic arch receptor potential Sympathetic cardiac nerve activity and sympathetic vasoconstrictor nerve activity and parasympathetic nerve activity Heart rate and stroke volume and arteriolar and venous vasodilation Rate of firing in afferent nerves Cardiovascular center Cardiac output and total peripheral resistance Baroreceptor reflex in response to an elevation in blood pressure When blood pressure falls below normal Carotid sinus and aortic arch receptor potential Rate of firing in afferent nerves Cardiovascular center Blood pressure increased toward normal Cardiac output and total peripheral resistance Heart rate and stroke volume and arteriolar and venous vasoconstriction Sympathetic cardiac nerve activity and sympathetic vasoconstrictor nerve activity and parasympathetic nerve activity Baroreceptor reflex in response to a fall in blood pressure
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Blood Pressure Abnormalities Hypotension: blood pressure below 100/60 mm Hg Orthostatic (postural) hypotension results from insufficient sympathetic compensation when a person moves from a horizontal to a vertical position Table tilt test
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Blood Pressure Abnormalities Hypertension: blood pressure above 140/90 mm Hg Two classes of hypertension: primary hypertension- unknown cause (~90% of cases) Some potential causes: excessive salt intake, defect in salt management of kidneys, diet, plasma membrane abnormalities, excess vasopressin, abnormalities in vasoactive chemical signaling secondary - occurs secondary to another known primary problem (~10% of cases)
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US Obesity Statistics
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Hypertension medications (angiotensin-converting-enzyme inhibitors) Diuretics: increase urinary output (reduce blood volume) & others (angiotensin receptor blockers; alpha blockers; NE blockers, etc.)
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