Regulation of Blood Pressure Flashcards
Center responsible for regulation of HR and BP
Medulla (Vasomotor area)
LATERAL portion - EXCITATORY (inc HR and BP)
MEDIAL portion - INHIBITORY ( dec HR and BP)
Acute Control
ANS control Baroreceptors Chemoreceptors Low Pressure Receptors CNS Ischemic Response
Long Term Control
Renin Angiotensin Aldosterone System (RAAS)
To Increase BP via ANS
Arteriolar vasoconstriction
Venous vasoconstriction
Inc HR and SV via B1 receptors of the heart
Buffers minute to minute changes in BP
Baroreceptors
Stretch receptors sites
Carotid SINUS
Aortic ARCH
Increased BP
Inc stretch – inc firing of CN IX to NTS – trigger PARAsympathetic response
Decreased BP
dec stretch – dec firing of CN IX to NTS – trigger SYMPAthetic response
Branch of CN IX that carries signals from carotid sinus to NTS
Hering Nerve
Respond increase/decrease in pressures from 50 mmHg - 180 mmHg
Carotid Baroreceptors
Respond increase in pressure > 80 mmHg
Aortic Baroreceptors
Set point for MAP in Vasomotor center
100 mmHg
Post op patient suddenly stands up after being supine. This will INCREASE
HR
Expiring against closed Glottis (VALSALVA)
INC intrathoracic pressure – dec VR – dec CO and BP – sensed by BR – INC HR
CHEMORECEPTORS induce changes in BP
respons to low O2, high CO2 concentration when BP
<80 mmHg