Pulmonary circulation Flashcards
Where does oxygen-poor blood leave the heart?
It leaves through the right ventricle
What are the two arteries that supply blood to the lung?
Pulmonary arteries and Bronchial arteries
What are pulmonary alveolar vessels?
Thin walled capillaries that are subject to pressure changes
What are pulmonary extra-alveolar vessels?
Pulmonary arteries and veins that accompany the bronchi in a connective tissue ‘sheath’
What is the bronchovascular bundle?
The connective tissue sheath in the lungs
What determines the behaviour of the extra alveolar vessels?
Determined by pressure changes within the connective tissue space of the bronchovascular bundle
What is the peribronchial plexus?
A network of blood vessels around the bronchi
How much of the total output from the left ventricle goes towards bronchial circulation?
Around 2%
What is the azygous vein?
The azygous vein carries blood from the back of your chest and abdomen to your heart
What is the vasa vasorum?
small blood vessels that supply the walls of larger arteries
What is the consequence of the bronchial vessels anastomose with the pulmonary vessels?
It means that the lungs will not die if one of the circulations is obstructed
What is cardiac output?
The volume of blood that is pumped out the heart per minute (Heart rate X Stroke Volume)
How do pulmonary vessels reduce their resistance when more blood is pumped through the lungs?
Using their smooth muscle they increase their diameter
What is capillary recruitment?
Vessels that were previously closed open up which decreases the overall pressure
How do Horses increase their blood flow?
The right hand side of the heart pumps out around 120ml of blood, so the capillary bed in the lungs receives around 100 (it is specially adapted for this)
