Respiratory System

Question 1

mucus

Answer 1

traps dust and microbes in the nose and trachea

Question 2

cilia

Answer 2

tiny hairs wafting mucus to be blown out or tranchea/oesophagus junction to be killed in stomach

Question 3

inhalation

Answer 3

diaphragm flattens, ribs move up and out, chest volume increases, pressure decreases, air drawn into lungs

Question 4

exhalation

Answer 4

diaphragm moves up, ribs move down and in, chest volume decreases, pressure increases, air forced out of lungs

Question 5

alveoli

Answer 5

adaptation for gas exchange, tiny clusters in lungs increasing surface area, surrounded by blood capillaries maintaining a high concentration gradient, one cell thick for short diffusion path