Regulation of Blood Pressure Flashcards

1
Q

Center responsible for regulation of HR and BP

A

Medulla (Vasomotor area)

LATERAL portion - EXCITATORY (inc HR and BP)

MEDIAL portion - INHIBITORY ( dec HR and BP)

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2
Q

Acute Control

A
ANS control
Baroreceptors
Chemoreceptors
Low Pressure Receptors
CNS Ischemic Response
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3
Q

Long Term Control

A

Renin Angiotensin Aldosterone System (RAAS)

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4
Q

To Increase BP via ANS

A

Arteriolar vasoconstriction

Venous vasoconstriction

Inc HR and SV via B1 receptors of the heart

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5
Q

Buffers minute to minute changes in BP

A

Baroreceptors

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6
Q

Stretch receptors sites

A

Carotid SINUS

Aortic ARCH

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7
Q

Increased BP

A

Inc stretch – inc firing of CN IX to NTS – trigger PARAsympathetic response

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8
Q

Decreased BP

A

dec stretch – dec firing of CN IX to NTS – trigger SYMPAthetic response

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9
Q

Branch of CN IX that carries signals from carotid sinus to NTS

A

Hering Nerve

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10
Q

Respond increase/decrease in pressures from 50 mmHg - 180 mmHg

A

Carotid Baroreceptors

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11
Q

Respond increase in pressure > 80 mmHg

A

Aortic Baroreceptors

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12
Q

Set point for MAP in Vasomotor center

A

100 mmHg

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13
Q

Post op patient suddenly stands up after being supine. This will INCREASE

A

HR

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14
Q

Expiring against closed Glottis (VALSALVA)

A

INC intrathoracic pressure – dec VR – dec CO and BP – sensed by BR – INC HR

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15
Q

CHEMORECEPTORS induce changes in BP

respons to low O2, high CO2 concentration when BP

A

<80 mmHg

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16
Q

LOW PRESSURE RECEPTORS (Cardiopulmonary Baroreceptors)

detects fullness of vascular system

in response to increased intravascular volume

A

INCREASED Atrial Natriuretic Peptide (ANP)

inc Na and H20 excretion

17
Q

CNS ischemic response

A

starts at BP < 60 mmHg and optimal at BP = 15-20 mmHg

18
Q

All systemic arterioles vasoconstrict severely EXCEPT

A

Coronary Vessels

Cerebral Vessels

19
Q

Occurs in response to INC ICP

A

Cushing Reaction or Cushing Reflex

HPN, Bradycardia, Irregular Respirations