Unit 2- Absorption Of Materials

Question 1

Parts of the lungs where gases are exchanged

Answer 1

Alveoli

Question 2

Molecule that diffuses from blood into lung alveoli

Answer 2

Carbon dioxide

Question 3

Molecule that that diffuses from the alveoli into the red blood cells in blood capillaries

Answer 3

Oxygen

Question 4

Features of alveoli that make them more efficient for the diffusion of gases

Answer 4

Thin cell wall Large surface area Moist to allow fast diffusion

Question 5

Traps dirt and micro-organisms in the lung airways

Answer 5

Mucus

Question 6

Sweeps mucus and trapped dirt out of the lung airways

Answer 6

Cilia

Question 7

Muscular contractions that move food through the digestive system

Answer 7

Peristalsis

Question 8

Structures in the small intestine that absorb food molecules

Answer 8

Villi

Question 9

Characteristics of the villi in the small intestine that makes them efficient at absorbing food molecules

Answer 9

Large surface area

Extensive capillary network

One cell thick

Question 10

Molecules absorbed by the capillaries in the small intestine villi

Answer 10

Glucose and amino acids

Question 11

Molecules absorbed by the lacteal in the small intestine villi

Answer 11

Fatty acids and glycerol

Question 12

Part of villus that absorbs the products of fat digestion

Answer 12

Lacteal