MAP regulation

Question 1

Carotid sinus innervation

Answer 1

Sinus n of herring —> glossopharyngeal n

Question 2

Aortic sinus innervation

Answer 2

Aortic n —> vagus n

Question 3

NTS

Answer 3

Located in brain stem, receives and coordinate peripheral signals

Both sinuses travel here

Question 4

Dorsal motor nucleus of the vagus and nucleus ambiguus

Answer 4

Parasympathetic activity associated w/ CV function

Question 5

Rostrum ventrolateral medulla

Answer 5

Sympathetic activity associated w/ CV function

Question 6

Which sinus will response to a decrease in pressure?

Answer 6

The carotid sinus

Question 7

What carries out long term adjustment of MAP?

Answer 7

Renin-Angiotensin II-Aldosterone system (RAAS)

Controls BP by regulations blood volume

Question 8

Renin

Answer 8

Stimulated by B1 adrenergic activation

Causes angiotensinogen to convert to angiotensin I in he blood

Angiotensin I is converted to angiotensin II in the lung by ACE and will begin compensation

Question 9

What secretes renin

Answer 9

Juxtaglomerular cells in the walls of afferent arterioles

Question 10

Angiotensin II and its role in RAAS

Answer 10

Causes secretion of aldosterone from adrenal cortex

Stimulates secretion of ADH to increase fluid retention

Causes vasoconstriction by binding specific receptors to increase TPR and BP

Question 11

Aldosterone in RAAS

Answer 11

Increases Na+ and H2O retention by the kidney and will increase BP, preload, CO, and therefore BP

Question 12

Vasopressin

Answer 12

ADH

Acts on V1 (smooth muscle and V2 receptors to increase TPR and water retention

Question 13

Natriuretic peptide

Answer 13

Causes arteriolar dilation, increases fluid loss, and inhibits renin

Helps decrease BP