Key Area 7- Absorption of materials

Question 1

What needs to be absorbed into the bloodstream and delivered to cells for respiration?

Answer 1

Oxygen and nutrients

Question 2

What must be removed from cells into the bloodstream?

Answer 2

Waste materials like carbon dioxide

Question 3

Why do tissues contain capillary networks?

Answer 3

To allow the exchange of materials at cellular level.

Question 4

What features do materials that absorb materials have in common?

Answer 4

-large surface area
-thin walls
-good blood supply
These increase the efficiency of absorption.

Question 5

How are lungs adapted from gas exchange?

Answer 5

They consist of a large number of alveoli
providing a large surface area

Question 6

What is absorbed through the thin alveolar walls to or from the many blood capillaries?

Answer 6

Oxygen and carbon dioxide

Question 7

How does the small intestine absorb nutrients from food?

Answer 7

The small intestine is folded into tiny villi, this increases the surface area to allow more nutrients to be absorbed.

Question 8

What does the capillaries do in the small intestine?

Answer 8

To absorb glucose and amino acids

Question 9

What does the lacteal do in the small intestine?

Answer 9

To absorb fatty acids and glycerol