KA2.7 - Absorption of Materials

Question 1

Oxygen from the air and nutrients from food must be absorbed into the bloodstream for cells to do …

Answer 1

Respiration.

Question 2

Waste materials, such as … must be removed from cells into the bloodstream.

Answer 2

Carbon dioxide.

Question 3

What are the features found in surfaces that absorb materials?

Answer 3

• Large surface area.
• Thin walls.
• Extensive blood supply.
• These all increase the efficiency of absorption.

Question 4

The purpose of the lungs is to exchange …

Answer 4

Gas. The purpose of the lungs is to exchange gas, e.g. oxygen and carbon dioxide.

Question 5

Name the structure that keeps airways open?

Answer 5

Rings of cartilage.

Question 6

What is the site of gas exchange in the lungs?

Answer 6

Alveoli.

Question 7

What features make the alveoli good at gas exchange?

Answer 7

• Large surface area due to high number.
• Thin walls.
• Extensive blood supply.
• Moist surface (allows gases to exchange easier).

Question 8

The … in the small intestine absorb nutrients from food into the blood.

Answer 8

Villi.

Question 9

Describe the structure of the villi (picture the diagram in your head and label it)?

Answer 9

A villi has a lacteal and capillaries and looks like a thick hair.

Question 10

In the villi the blood capillary absorbs … and … , and the lacteal absorbs … and …

Answer 10

glucose and amino acids … fatty acids and glycerol.

In the villi the blood capillary absorbs glucose and amino acids, and the lacteal absorbs fatty acids and glycerol.