Pulmonary blood flow rogers

Question 1

Blood from bronchial circulation returns to heart by

Answer 1

1. a plexus around the hilum, blood from the pleurohilar part of the bronchail circulation returns to superior vena cava via azygos vein
2. passes through postcapillary anastomoses to join the pulmonary veins

Question 2

pulmonary circulation: bronchial vessels

Answer 2

high pressure, low flow circulation

systemic arterial blood to trachea, bronchial tree, support tissues of lung

oxygenated at start

Question 3

pulmonary circulation: pulmonary vessels

Answer 3

venous blood to alveolar capillaries for gas exchange

from pulmonary artery

deoxygenated at start

Question 4

Alveolar vessels

Answer 4

from right ventricle

gas exchange

millions of alveoli covered in a sheet of capillaries

Question 5

extra alveolar vessels

Answer 5

larger vessels that feed alveolar capillaries

some from left ventricle

deliver gas to lung tissue

return to heart in pulmonary veins as a venous admixture

Question 6

Pulmonary vascular resistance

Answer 6

determined by high capillary content, less sympathetic tone, smooth muscle at arteriole level

determined by number of alveoli open and lung volume

decreases during exercise due to recruitment of more capillaries and distension of capillaries