7. Absorption of Materials

Question 1

Oxygen and food must be delivered to cells for

Answer 1

Respiration

Question 2

Capillary networks have these features to make them efficient at absorption

Answer 2

• large surface area
• thin walls
• extensive blood supply

Question 3

Capillary networks have these features to make them efficient at absorption

Answer 3

• large surface area
• thin walls
• extensive blood supply

Question 4

The organs responsible for GAS EXCHANGE in the body are

Answer 4

The Lungs

Question 5

The organs responsible for GAS EXCHANGE in the body are

Answer 5

The Lungs

Question 6

Oxygen diffuses from a high concentration in the lungs to

Answer 6

a low concentration in the blood

Question 7

Carbon dioxide diffuses from a high concentration in the blood to

Answer 7

a low concentration in the lungs

Question 8

Gas exchange takes place in air sacs called

Answer 8

Alveoli

Question 9

The small intestine is lined by structures called

Answer 9

Villi

Question 10

There are a large number of villi in the small intestine to

Answer 10

Increase the surface area for absorption (of digested food/nutrients)

Question 11

The walls of the villi are

Answer 11

one cell thick (to allow rapid diffusion)

Question 12

Villi contain a network of BLOOD CAPILLARIES to

Answer 12

absorb glucose and amino acids.

Question 13

Villi contain a LACTEAL to

Answer 13

absorb fatty acids and glycerol