Cardiovascular Regulation

Question 1

What’s the role of the cardiovascular centre?

Answer 1

MEDULLA OBLONGATA
- baro/chemo receptors

Question 2

What’s the baroreceptor reflex?

Answer 2

PRESSURE RECEPTOR
1. Baro receptors detect stimuli
2. Afferent pathway -> coordination centre (cranial nerves)
3. Efferent pathways -> effector (through vagus nerve)

Question 3

What are the atrial and pulmonary stretch receptors?

Answer 3

• respond to changes in blood pressure
• regulate blood volume (influence cardiac output)

Question 4

What are chemoreceptors reflexes?

Answer 4

Monitor chemical composition changes in blood
- respiratory regulation

Question 5

Discuss the hormonal regulation of blood pressure.

Answer 5

Renin-Angiotensin-Aldosterone System
1. fall in blood volume/renal blood flow
2. detected by juxtaglomerular cells in kidney
3. release renin
4. vasoconstriction
5. secretion of aldosterone
6. increased retention of Na+ and H2O in kidneys
7. increase blood volume