ST.7 Absorption of Materials N5 (MO)

Question 1

Why does oxygen and food have to be absorbed into the bloodstream?

Answer 1

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

Question 2

How are waste materials removed from cells?

Answer 2

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

Question 3

Why do tissues contain capillary networks

Answer 3

Tissues contain capillary networks to allow the exchange of materials at cellular level

Question 4

What features do surfaces involved in absorption of materials have and why?

Answer 4

Surfaces involved in the absorption of materials have certain features in common to increase the efficiency of absorption:
- large surface area
- thin walls
- extensive blood supply

Question 5

What are lungs?

Answer 5

Lungs are gas exchange organs

Question 6

What do lungs consist of?

Answer 6

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

Question 7

How are oxygen and carbon dioxide absorbed?

Answer 7

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

Question 8

How are nutrients from food absorbed?

Answer 8

Nutrients from food are absorbed into the villi in the small intestine

Question 9

What does the large number of thin walled villi do?

Answer 9

The large number of thin walled villi provides a large surface area

Question 10

What does each villus contain?

Answer 10

Each villus contains a network of capillaries to absorb glucose and amino acids and a lacteal to absorb fatty acids and glycerol