Diffusion of gases between alveoli and blood

Question 1

blood supply to lungs

Answer 1

pulmonary artery carries deoxygenated blood away from the heart and pulmonary vein carries oxygenated blood towards the heart from the lungs

Question 2

factors that influence diffusion of gases across the alveoli

Answer 2

surface area, thin membrane, surfactant, distance to capillaries

Question 3

abbreviations used to describe partial pressures of gases in systemic arteries

Answer 3

PaO2

Question 4

abbreviations used to describe partial pressures of gases in veins or pulmonary artery

Answer 4

Pv with squiggly line overO2

Question 5

bronchial circulation

Answer 5

supplied via the bronchial arteries arising from systemic circulation to supply oxygenated blood to lung tissues. blood drains to left atrium via pulmonary veins

Question 6

pulmonary circulation

Answer 6

consists of L and R pulmonary arteries originating from the right ventricle. supplies the dense capillary network surrounding the alveoli and returns oxygenated blood to left atrium via pulmonary vein

Question 7

diffusion of gases between alveoli and blood obeys what

Answer 7

rules for simple diffusion- gas will move across a membrane permeable to it, down its partial pressure gradient, will continue to do so until equilibrium is reached

Question 8

normal partial pressures in alveoli

Answer 8

PO2 100mmHg/ 13.3kPa, PCO2 40mmHg/ 5.3kPa

Question 9

normal partial pressures in arteries

Answer 9

PO2 100mmHg/ 13.3kPa, PCO2 40mmHg/ 5.3kPa

Question 10

normal partial pressures in veins and pulmonary arteries

Answer 10

PO2 40mmHg/ 5.3kPa, PCO2 46mmHg/ 6.2kPa