Control of blood pressure

Question 1

How to calculate BP

Answer 1

BP=COXPR cardiac output x peripheral resistance

Question 2

How does the body maintain normal BP?

Answer 2

Adjusting CO and PR

Question 3

What does Frank-starling law of heart say?

Answer 3

Relationship between cardia muscle length and force of contraction

Question 4

What happens as the venous blood returns to the heart?

Answer 4

The greater the length of stretched cardiac muscle fibres, the stronger the ventricular contraction that will follow

Question 5

What does a stronger contraction increase?

Answer 5

SV and CO

Question 6

What is the volume of blood that is pumped out of the heart the same as?

Answer 6

The volume that enters the heart

Question 7

what is CO+PR resistances partially controlled by?

Answer 7

Baroreceptors reflexes

Question 8

Where are the baroreceptors sense located in BP

Answer 8

Aortic arch and carotid arteries

Question 9

What does cardio inhibitor reflexes do?

Answer 9

If arterial BP increase, baroreceptors sends impulses to the cardiac centre of the medulla oblongata
Then sends parasympathetic impulses to SA node to slow HR- result in decrease in CO +BP

Question 10

What does the cardo accelerator reflex do?

Answer 10

If atrial BP decrease the medulla oblongata sends out synthetic impulses to increase HR- increase CO + BP

Question 11

Steps if cardiac output increases

Answer 11

BP increase- baroreceptor in aortic arch and carotid sinus are stimulated- sensory impulses to the cardiac centre-parasympathetic impulses to the heart-SA node inhibited-HR decreases-BP returns to normal