Flashcards in Special Circulations Deck (210)
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1
What circulations do the lungs have?
Bronchial circulation and Pulmonary circulation
2
What is the bronchial circulation part of?
The systemic circulation
3
What is the purpose of the bronchial circulation?
It meets the metabolic and oxygen requirements of lungs
4
What does the bronchial circulation ensure?
That those parts that are not readily perfused with oxygen are close to an oxygen supply
5
How is the pulmonary circulation related to the systemic circulation?
It is in series
6
What is the purpose of the pulmonary circulation?
It supplies blood to the alveoli, which is required for gas exchange
7
What gas exchange needs to occur at the lungs?
Needs to oxygenate blood, and allow for removal of carbon dioxide
8
What must the pulmonary circulation accept?
The entire cardiac output
9
Are the equal amounts of blood in the pulmonary and systemic circulations?
No
10
What is cardiac output at rest?
~5l/min
11
What does cardiac output have the ability to do?
Increase when exercising
12
What is the maximum cardiac output?
~20-25l/min
13
Is flow the same in systemic and pulmonary circulations?
Yes
14
How does the pulmonary circulation differ from the systemic?
It works with a much lower pressure and resistance
15
What is the pressure in the right ventricle?
15–30mmHg in systole
0-8mmHg in diastole
16
What is the pressure in the pulmonary artery?
15-30mmHg systole
4-12mmHg diastolic
17
Why is pulmonary artery pressure higher in diastole than right ventricle?
Due to elastic recoil and closure of valve
18
What is the pressure in the left atrium?
1-10mmHg
19
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
20
How does the pressure of the left ventricle differ from the right?
It is higher
21
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
22
What is the pressure in the aorta?
100-140mmHg systolic
60-90mmHg diastolic
23
Why is the pressure high in the aorta?
Because the wall is thicker
24
What is the pressure in the right atrium?
0-8mmHg
25
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
26
What happens to the right ventricles in systole?
It contracts, and so pressure goes up
27
What are the features of the pulmonary circulation?
Low pressure
Low resistance
28
What is the mean arterial pressure in the pulmonary circulation?
12-15mmHg
29
What is the mean capillary pressure in the pulmonary circulation?
9-12mmHg
30
