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Lecture 8

Lecture 8

15 Pages
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Department
Biological Sciences
Course Code
BIOC34H3
Professor
Stephen Reid

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Blood Pressure Regulation
Extrinsic Mechanisms
Long Term BP Regulation (minutes to days)
Short Term BP Regulation (seconds to minutes)
The Baroreflex
;0$3
Baroreceptors
;3DUDV\PSDWKHWLF
(vagal) activity 96\PSDWKHWLF
activity
9+5 9699735
Flow to the heart and brain is maintained; reductions in flow to other organs.
nMAP
Baroreceptor:
blood pressure
receptor
(stretch)
Short term accommodation of blood pressure is accomplished by the baroreflex.
The converse is also true for this graph if the MAP goes up.
www.notesolution.com
The Baroreflex
Arterial Baroreceptors
carotid
body
common
carotid
internal
carotid external
carotid
Aortic
Arch
carotid
sinus
Aortic arch: Sense pressure changes that
can effect blood flow to the whole body.
aortic
arch
Carotid sinus: Sense pressure
of the blood flowing
to the brain
We have 2 sets of baroreceptors: one in the aortic arch, just as it leaves the left ventricle and
makes the curve towards the body, and the other in the carotid sinus t the little sinus/bulging of
the common carotid, just downstream from the carotid body t primary site of oxygen receptors.
www.notesolution.com
www.notesolution.com

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Description
Blood Pressure Regulation Extrinsic Mechanisms Short Term BPRegulation (seconds to minutes) Long Term BPRegulation (minutes to days) The Baroreflex Baroreceptor: blood pressure ;! receptor (stretch) Baroreceptors ;!,7,825,9K09L. $25,9K09L. (vagal) activity activity +# $ %!# n MAP Flow to the heart and brain is maintained; reductions in flow to other organs. Short term accommodation of blood pressure is accomplished by the baroreflex. The converse is also true for this graph if the MAP goes up. www.notesolution.com The Baroreflex carotid Arterial Baroreceptors body internal carotid carotid external Carotid sinus: Sense pressure sinus carotid of the blood flowing to the brain common carotid Aortic Arch aortic arch Aortic arch: Sense pressure changes that can effect blood flow to the whole body. We have 2 sets of baroreceptors: one in the aortic arch, just as it leaves the left ventricle and makes the curve towards the body, and the other in the carotid sinus J the little sinusbulging of the common carotid, just downstream from the carotid body J primary site of oxygen receptors. www.notesolution.com
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