Respiratory system

Question 1

What is the pathway of air?

Answer 1

1) we breath air through the nose/ mouth.
2) the air travels down the trachea.
3) the air passes through the bronchi.
4) air then moves through the bronchioles.
5) gaseous exchange occurs in the alveoli.

Question 2

Name 4 feature of alveoli that make the effiecent for gaseous exchange.

Answer 2

1) large surface area as there is so many of them.
2) very thin, moist walls so gas can easily pass through.
3) have a good blood supply as they are surrounded by capillaries.
4) shale makes them well ventilated, so gases can pass through easily.

Question 3

What happens during inspiration?

Answer 3

Diaphragm and intercostal muscles contract. Rib cage moves up and out pressure in the thorax decreases. Air rushes is in

Question 4

What happens during expiration?

Answer 4

Famine, intercostal muscles, relax. Rib cage moves in and down. Pressure in the thorax increases air rushes out