Absorption Of Materials Flashcards
(17 cards)
What is the site of absorption for gases?
Alveoli (Lungs)
What is the site of absorption for digested material?
Villi (Small intestine)
Where does gas exchange occur?
Lungs
Does oxygen leave or enter the bloodstream?
Enter
Does carbon dioxide leave or enter the bloodstream?
Leave
Why do the lungs contain many alveoli?
Increase the surface area for gas exchange
How thick is the surface of the alveoli and what are they covered in?
1 cell thick
Covered in capillaries
Why are alveoli covered in capillaries?
Increase gas exchange
How do oxygen and carbon dioxide move?
Diffusion
What is digestion?
Chemical and mechanical processes which break down food soluble molecules
What does digestion break food down into?
Soluble molecules
Where are the nutrients of food absorbed into?
Small intestine
What is the surface of the small intestine folded to form?
Villi
Are the walls of villi thick or thin?
Thin
Why are the walls of villi thin?
Increase absorbance
What are amino acids and glucose absorbed by?
Capillaries
What are fatty acids and glycerol absorbed by?
lacteal
