Absorption Of Materials

Question 1

What is the function of the lungs

Answer 1

They are gas exchange organs that take in oxygen from the air during breathing in.

Question 2

During breathing in, what is the oxygen absorbed into?

Answer 2

The bloodstream

Question 3

What gas passes from the bloodstream into the lungs where it is breathed out of the body?

Answer 3

Carbon dioxide

Question 4

What is the site of gas exchange in the lungs?

Answer 4

Alveoli

Question 5

What provides a large surface area for gas exchange?

Answer 5

The lungs contain a large number of alveoli

Question 6

How are oxygen and carbon dioxide easily absorbed through the alveoli walls?

Answer 6

Their walls are only one cell thick

Question 7

What gives alveoli a good blood supply?

Answer 7

They are surrounded by many capillaries

Question 8

By which process is food broken down into smaller soluble nutrients?

Answer 8

Digestion

Question 9

What is the function of the small intestine?

Answer 9

To absorb nutrients from food

Question 10

The surface of the small intestine is covered in millions of finger-like projections called what?

Answer 10

Villi

Question 11

Give 3 factors that increase the efficiency of absorption

Answer 11

1. The large number of villi in the small intestine provides a large surface area.
2. The lining of the villi is only 1 cells thick.
3. Blood capillaries in each villus provides a good blood supply to transport glucose and amino acids

Question 12

What does the lacteal absorb?

Answer 12

Fatty acids and glycerol