Physiology: Short term control of blood pressure

Question 1

What is the formula of MAP?

Answer 1

MAP = CO x TPR

Question 2

What is the MAP in circulation?

Answer 2

Driving force pushing blood through the circulation

Question 3

What happens when blood pressure is too low?

Answer 3

Fainting (syncope)

Question 4

What happens when blood pressure is too high?

Answer 4

Hypertension

Question 5

How do baroreceptors pick up changes in pressure?

Answer 5

They are stretch sensitive

Question 6

What are the carotid sinus baroreceptors innervated by?

Answer 6

Glossapharyngeal nerve

Question 7

What are the aortic arch baroreceptors innervated by?

Answer 7

Vagus Nerve

Question 8

What is the name of the centres in the brain that control blood pressure?

Answer 8

Medullary Cardiovascular Centres

Question 9

What does vagus nerve stimulation cause to the heart?

Answer 9

Decrease in HR

Parasympathetic

Question 10

What does sympathetic nerve stimulation cause to the heart?

Answer 10

Increase in HR

Increase in muscle contraction venoconstriction and arteriolar constriction

Question 11

Name the inputs of the medullary cardiovascular centres

Answer 11

Carotid sinus baroreceptors 
Aortic arch baroreceptors 
Cardiopulmonary Baroreceptors
Central Chemoreceptors
Chemoreceptors in muscle 
Joint receptors 
Higher Centres