Gas Exchange Flashcards
Gas exchange takes place where
Alveoli
The alveoli provide a
Large surface area
The pulmonary artery brings what from the heart to the lungs
Deoxygenated blood
The capillaries eventually join up to form branches of the
Pulmonary vein
The pulmonary vein dose what
Takes oxygenated blood back to the heart from the lungs
What is the inner surface of the alveoli is always
Moist
The fluid that covers the cells contains a
Surfactant
What dose a surfactant act as
A detergent
What dose the surfactant do
Reduces the surface tension and stop the alveoli from sticking together when you breath in and out
The wall of the alveolus is made up of
Very thin layers of flattened cells called epithelium
The capillaries have What cells
Thin flattened cells two
The surface area features of gas exchange are
There are millions of tiny alveoli in each lung
Each alveoli is folded so that there is an even greater surface area in the space available
A thin permeable surface of gas exchange
The epithelium of the alveolus is made of very thin flattened cells
The Walls of the capillaries is also made of wry thin flat cells
The capillaries Walls are in class contact with the alveolus Walls
A large diffusion gradient
Ventilation brings air high in oxygen and low in carbon dioxide into the alveoli and takes away air in high co2 and low in oxygen
The capillaries constantly bring deoxygenated blood to the alveoli and remove oxygenate blood
