M3 - HUMAN RESPIRATORY SYSTEM

Question 1

goblet cells

Answer 1

in trachea, bronchi and bronchioles
secrete mucus to help trap dust and pathogens

Question 2

cilia

Answer 2

wafts trapped dust and pathogens away from lungs into the stomach

Question 3

elastic fibres

Answer 3

alveoli, bronchi and bronchioles
allows them to expand and contract when breathing which can also increase SA

Question 4

cartilate

Answer 4

holds trachea and airways open so they dont collapse

Question 5

INSPIRATION

Answer 5

• diaphragm contracts and flattens
• external intercostal muscles contract and push ribcage up and out
• thorax volume increases, decreasing pressure
• air moves into lungs from high to low pressures

Question 6

EXPIRATION

Answer 6

• diaphragm relaxes and curves upwards
• external intercostal muscles relax and ribcage moves down and in
• thorax volume decreases and pressure increases
• air moves out of lungs