Presentaci

1
(No Transcript)
2
How some animals take oxygen from the air
Click on each box to find out more
Natural Science 2. Secondary Education
3
How some animals take oxygen from the air
Respiration through tracheae

• This type of respiration occurs in almost all
  insects.
• Tracheae are very thin tubes that branch out to
  provide the animals tissues with oxygen.
• They lead out of the body through pores called
  spiracles.

Spiracle
The insects tissues
Trachea
CO2
O2
Exoskeleton
Respiration through tracheae in an insect.
Go back to the Start menu
Natural Science 2. Secondary Education
4
How some animals take oxygen from the air
Respiration through lungs

• This type of respiration occurs in amphibians,
  reptiles, birds and mammals.
• Lungs are made up of millions of tiny tubes or
  cavities called alveoli, which are full of
  capillaries. This is where oxygen passes into the
  blood.
• Lungs are connected to the external environment
  by the rest of the respiratory tract (airways).

Blood with CO2
Blood with O2
Airways
O2
CO2
Lungs
Respiration through lungs in a mammal.
Go back to the Start menu
Natural Science 2. Secondary Education