Blood Pressure negative feedback loop

Increased blood pressure

Stimulate baroreceptors

Medullary Cardiovascular Centre

Sympathetic de-activation

Pressor centre inhibited

Vasoconstriction

Decreased blood pressure

1

2

3

4

5

6

9

Pressor centre increased

Sympathetic Activation

Increased cardiac output

Vasodilatation

9

10

11

12

13

Release of ADH

Increased blood volume

7

8

Stimulates cardioinhibitry centre

Parasymp. activation

3

4

5

Increased CO2, decreased O2/pH

Stimulate chemoreceptors

Vasoconstriction

Reduced cardiac output

Reduced heart rate

1

2

3

3

Medullary Cardiovascular Centre

Pressor centre inhibited

Sympathetic de-activation

4

5

4

6

Decreased venous return and cardiac output

Decreased peripheral resistance

8

6

Inhibits cardioacceleratory centre

3

Decreased cardiac output

4

5

7

10

when diving

Sympathetic activation

Increased HR and contraction force

Increased cardiac output

3

4

5