Exchange Of Gases In The Lungs Flashcards
Where is the site of gas exchange in mammals
The epithelium of the alveoli
What does alveoli been thin mean
They are easily damaged and therefore are often located inside an organism for protection
Why will diffusion of gases between the alveoli and the blood will be very rapid?
Red blood cells are slowed as they pass through the pulmonary capillaries, allowing more time for diffusion
The distance between the alveolar air and red blood cells is reduced as the red blood cells are flattened against the capillary walls
The walls of both alveoli and capillaries are very thin and therefore the distance over which diffusion takes place is very short
Alveoli and Pulmonary capillaries have a very large total SA
Breathing movements constantly ventilate the lungs, and the action of the heart constantly circulate blood around the alveoli. Together, these ensure that a steep concentration gradient of the gases to be exchanged is maintained
Blood flow through the Pulmonary capillaries maintains a concentration gradient
What are the risk factors of lung disease
Smoking Air-pollution Genetic make up Infections Occupation
