HUMAN BREATHING SYSTEM LEAVING CERT EXAM QUESTIONS AND ANSWERS

HUMAN BREATHING SYSTEM LEAVING
CERT EXAM QUESTIONS AND
ANSWERS
Human breathing system - Answer-[extra labels needed]

Nostrils - Answer-allow air to enter the nose

Nose - Answer-warms, filters and moistens air

Pharynx - Answer-connects mouth and nose to larynx

Epiglottis - Answer-stops food/drink entering the trachea

Larynx - Answer-contains vocal chords

Trachea - Answer-allows air to pass to lungs

Cartilage - Answer-keeps trachea and bronchi open

Function of lungs - Answer-takes in O2 and gets rid of CO2

Bronchus - Answer-transports air into lungs

Bronchiole - Answer-transports air to alveoli

Alveoli - Answer-site of gaseous exchange

Pleural membranes - Answer-allow friction free movement of lungs

The lungs - Answer-- located in thorax region

- all the air pipes are lined with mucus secreting cells and cilia which move the mucus
containing the trapped pathogens

Gaseous exchange in alveoli - Answer-- alveoli are very plentiful to increase surface are

- the air in alveoli is O2 rich but the blood in capillaries in O2 poor, so O2 diffuses from
the alveoli into the blood capillaries

- CO2 is high in the blood capillaries but low in the alveoli so it diffuses out of the
capillaries into the alveoli