Flashcards in Special Circulations Deck (210)
What circulations do the lungs have?
Bronchial circulation and Pulmonary circulation
What is the bronchial circulation part of?
The systemic circulation
What is the purpose of the bronchial circulation?
It meets the metabolic and oxygen requirements of lungs
What does the bronchial circulation ensure?
That those parts that are not readily perfused with oxygen are close to an oxygen supply
How is the pulmonary circulation related to the systemic circulation?
It is in series
What is the purpose of the pulmonary circulation?
It supplies blood to the alveoli, which is required for gas exchange
What gas exchange needs to occur at the lungs?
Needs to oxygenate blood, and allow for removal of carbon dioxide
What must the pulmonary circulation accept?
The entire cardiac output
Are the equal amounts of blood in the pulmonary and systemic circulations?
What is cardiac output at rest?
What does cardiac output have the ability to do?
Increase when exercising
What is the maximum cardiac output?
Is flow the same in systemic and pulmonary circulations?
How does the pulmonary circulation differ from the systemic?
It works with a much lower pressure and resistance
What is the pressure in the right ventricle?
15–30mmHg in systole
0-8mmHg in diastole
What is the pressure in the pulmonary artery?
Why is pulmonary artery pressure higher in diastole than right ventricle?
Due to elastic recoil and closure of valve
What is the pressure in the left atrium?
Why is left atrial pressure a bit higher than right atrial pressure?
Because pulmonary circulation is at low resistance, so you don;t get as much of a drop in pressure
How does the pressure of the left ventricle differ from the right?
It is higher
Why is the pressure in the left ventricle higher than in the right ventricle?
Because the wall of the left ventricle is much thicker so it’s able to squeeze the blood around at a higher pressure
What is the pressure in the aorta?
Why is the pressure high in the aorta?
Because the wall is thicker
What is the pressure in the right atrium?
Why is the pressure in the RA and RV the same during diastole?
Because during diastole, the tricuspid valve is open, and so RA and RV are continuous
What happens to the right ventricles in systole?
It contracts, and so pressure goes up
What are the features of the pulmonary circulation?
What is the mean arterial pressure in the pulmonary circulation?
What is the mean capillary pressure in the pulmonary circulation?