Multicellular Organisms - 2.7 Absorption of materials Flashcards
1
Q
What are the features of capillaries ?
A
- thin-walled
- have a large surface area
- forming networks at the tissues
- organs to allow efficient exchange of materials.
2
Q
What from foods must be absorbed into the bloodstream to be delivered to cells for respiration ?
A
Oxygen and nutrients
3
Q
What waste materials must be removed from cells into the bloodstream ?
A
carbon dioxide
4
Q
Why do tissues contain capillary networks ?
A
to allow the exchange of materials at cellular level.
5
Q
What features do Surfaces involved in the absorption of materials have in common ?
A
- large surface area
- thin walls
- extensive blood supply.
6
Q
What are the gas exchange organs ?
A
lungs
7
Q
What do lungs consist of ?
A
a large number of alveoli providing a large surface area.
8
Q
Where are oxygen and carbon dioxide absorbed through ?
A
the thin alveolar walls to or from the many blood capillaries.
9
Q
Where is the nutrients from food absorbed ?
A
The villi in the small intestine
10
Q
A
