2.7 Absorption Of Materials

Question 1

What must oxygen and nutrients from food do

Answer 1

Oxygen and nutrients from food must be absorbed into the bloodstream to be delivered to cells for respiration

Question 2

What must happen to waste materials

Answer 2

Waste materials such as carbon dioxide must be removed from cells into the bloodstream

Question 3

What does tissue contain

Answer 3

Tissue contains capillary networks to allow the exchange of materials at cells

Question 4

What do surfaces involved in the absorption of materials have in common

Answer 4

Large surface area, thin walls, extensive blood supply. These increase the efficiency of absorption

Question 5

What are lungs and what do they consist of

Answer 5

Lungs are gas exchange organs and consist of a large number of alveoli providing a large surface area

Question 6

Describe how oxygen and carbon dioxide are absorbed through the thin alveolar walls to or from many blood capillaries

Answer 6

Alveoli are air sacs and when you breathe in air travels into these air sacs. This is when the gas exchange takes place. Alveoli provide a large surface area in your lungs, have very thin walls (one cell thick), and are surrounded by capillaries to provide an extensive supply of blood

Question 7

Where are nutrients of food absorbed

Answer 7

Nutrients of food are absorbed into the villi in the small intestine and the large number of thin walled villi provide a large surface area

Question 8

Describe how each villus contains a network of capillaries to absorb glucose and amino acids and a lacteal to absorb fatty acids and glycerol

Answer 8

Capillaries in each villus to provide a good blood supply to absorb glucose and amino acids

A lacteal to absorb fatty acids and glycerol