Diffusion of Gases between Alveoli and Blood Flashcards
What do pulmonary arteries do?
Carry deoxygenated blood away from the heart to the lungs.
What do pulmonary veins do?
Carry oxygenated blood towards the heart from the lungs.
What does pulmonary circulation do?
Delivers CO2 to the lungs and pciks up oxygen
How is the bronchial circulation supplied?
Via bronchial arteries arising from systemic circulation to supply oxygenated blood to lung tissues.
How much of the left heart output does the bronchial circulation make up?
2%
How does blood drain to the left atria?
Via pulmonary veins.
What does the pulmonary circulation consist of?
Left and right pulmonary arteries originating form the right ventricle.
What does the bronchial circulation supply the body with?
Nutritive supply, in supplying oxygen, supplying nutrients, enzymes, hormones.
What is the main function of the pulmonary circulation?
Collecting oxygen and delivering CO2.
Describe the flow and pressure of the pulmonary circulation.
Low pressure, high flow.
A=?
Alveolar
a=?
Arterial blood
ṽ=?
Mixed venous blood
Pa02=?
partial pressure of oxygen in arterial blood
PACO2=?
partial pressure of carbon dioxide in alveolar air
List the three things that the rate of diffusion across the cell membrane is proportional to.
-directly proportional to the available surface area
-directly proportional to the partial pressure gradient
-directly proportional to gas solubility
When is the rate of diffusion over membranes the shortest?
Over short distances.
What is the systemic pressure of the pulmonary arterial blood?
25mmHg
What is the diastolic pressure of the pulmonary arterial blood?
8mmHg
Why are the overall rates of diffusion fairly equal for oxygen and CO2?
CO2 diffuses more rapidly but O2 has a greater pressure gradient.
