Regulation of Blood Pressure

Question 1

Center responsible for regulation of HR and BP

Answer 1

Medulla (Vasomotor area)

LATERAL portion - EXCITATORY (inc HR and BP)

MEDIAL portion - INHIBITORY ( dec HR and BP)

Question 2

Acute Control

Answer 2

ANS control
Baroreceptors
Chemoreceptors
Low Pressure Receptors
CNS Ischemic Response

Question 3

Long Term Control

Answer 3

Renin Angiotensin Aldosterone System (RAAS)

Question 4

To Increase BP via ANS

Answer 4

Arteriolar vasoconstriction

Venous vasoconstriction

Inc HR and SV via B1 receptors of the heart

Question 5

Buffers minute to minute changes in BP

Answer 5

Baroreceptors

Question 6

Stretch receptors sites

Answer 6

Carotid SINUS

Aortic ARCH

Question 7

Increased BP

Answer 7

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

Question 8

Decreased BP

Answer 8

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

Question 9

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

Answer 9

Hering Nerve

Question 10

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

Answer 10

Carotid Baroreceptors

Question 11

Respond increase in pressure > 80 mmHg

Answer 11

Aortic Baroreceptors

Question 12

Set point for MAP in Vasomotor center

Answer 12

100 mmHg

Question 13

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

Answer 13

HR

Question 14

Expiring against closed Glottis (VALSALVA)

Answer 14

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

Question 15

CHEMORECEPTORS induce changes in BP

respons to low O2, high CO2 concentration when BP

Answer 15

<80 mmHg

Question 16

LOW PRESSURE RECEPTORS (Cardiopulmonary Baroreceptors)

detects fullness of vascular system

in response to increased intravascular volume

Answer 16

INCREASED Atrial Natriuretic Peptide (ANP)

inc Na and H20 excretion

Question 17

CNS ischemic response

Answer 17

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

Question 18

All systemic arterioles vasoconstrict severely EXCEPT

Answer 18

Coronary Vessels

Cerebral Vessels

Question 19

Occurs in response to INC ICP

Answer 19

Cushing Reaction or Cushing Reflex

HPN, Bradycardia, Irregular Respirations