Pressure and Flow in Arteries and Veins

Question 1

How does pressure change through arteries?

Answer 1

Falls slightly 95mmHg to 90mmHg

Question 2

How does pressure change through arterioles?

Answer 2

Drops from 90 to 40mmHg

Question 3

What is the pressure difference pushing blood back through veins?

Answer 3

20 to 5mmHg

Question 4

What is the pressure in the pulmonary circulation?

Answer 4

1/5th of systemic

Question 5

What is meant by pulse pressure?

Answer 5

Difference between systolic and diastolic pressure

Question 6

What is the respiratory pump?

Answer 6

Increased resp rate and depth increase venous return and edv

Question 7

What are the anti clotting mechanisms of the endothelium?

Answer 7

Stops blood contacting collagen
Produces prostacyclin and NO (inhibit platelet aggregation)
Produces tissue factor pathway inhibitor (stops thrombin)
Expresses thrombomodulin (inactivates thrombin)
Expresses heparin
Secretes tissue plasminogen activator (plasminogen->plasmin and digests clot)