B6. Respiration

Question 1

2 sets of muscles help breathing

Answer 1

INTERCOSTAL - between the ribs

DIAPHRAM - a large sheet of muscle and elastic tissue, underneath the lungs and heart.

Question 2

describe inhalation(breathing in)

Answer 2

external intercostal muscles contract,
➫they move the ribcage upward and outward - ➫volume of the thorax
diaphragm muscles contracts → diaphragm moves down

1 ↑ volume of the thorax
2 ↓ air pressure in the thoracic cavity
3 air rush into the lungs thr mouth/nose

Question 3

4 main toxic chemicals in tobacco smokes

Answer 3

carbon monoxide, nicotine, smoke particles and tar.

Question 4

describe the effect of smoke particles

Answer 4

inflammation/
→increase mucus production
→ paralyse/damage cilia
➫ bronchitis