Normal physiology 5 - Circulation

Question 1

how many pulmonary veins return oxygenated blood to the heart?

Answer 1

4

Question 2

what two main vessels distribute the de-oxygenated blood to the heart?

Answer 2

inferior and superior vena cava

Question 3

why do we need bronchial circulation (3)

Answer 3

• nutrition of bronchial tree
• maintenance of temperature and humidity of the airway wall and lining fluid layer
• provides blood elements (white celles) for inflammation and repair

Question 4

where does the bronchial de-oxygenated blood goes?

Answer 4

In the left atrium, with OXYgenated blood, creating a shunt

Question 5

Who supplies the bronchial tissues?

Answer 5

Bronchia arteries, arising from the aorta (systemic circulation)

Question 6

difference between pulmonary arteries and systemic circulation (other arteries) ?

Answer 6

The pulmonary arteries have very thin walls -

Question 7

why pulmonary arterial pressures are relatively low

Answer 7

Systemic blood flow is actively directed to various organs; this may require high pressure

The lung rarely directs blood from one region to another; therefore the arterial pressure is just high enough to lift blood to the top of the lung

Question 8

formula for resistance

Answer 8

R = pressure gradient / flow