The Human for a Respiratory System

Question 1

Label this diagram

Answer 1

Question 2

Label this Diagram

Answer 2

Question 3

Alveoli are adapted for gas exchange in the following ways;

Answer 3

• The alveoli have a good blood supply
• The moist lining allows oxygen to dissolve
• Thin walls of the alveoli mean that gases can pass through easily
• Large numbers of the alveoli produces a large surfae area

Question 4

What is the difference between inspired an expired air?

Answer 4

Inspired air is breathed in; Expired air is breathed out

Question 5

Expired out is…

Answer 5

• Has more water vapour
• Has more carbon dioxide
• Has less oxygen

Question 6

The Breathing Mechanism

Answer 6

• The Diaphragm moves down and the rib cage moves up and out
• This causes an increase in the volume of the thorax
• The increased volume of the thorax means its pressure is lower
• The lower pressure allow the lungs to expand. Air is drawn in
• The diaphragm moves upwards and the ribcage moves in and down
• This decreases the volume and increases the pressure in the thorax
• The increased pressure compresses the lungs and air is pushed out