Transcript How some animals take oxygen from the air

UNIT
2
The nutrition function
HOW SOME ANIMALS TAKE
OXYGEN FROM THE AIR
Natural Science 2. Secondary Education
UNIT
2
How some animals take oxygen from the air
RESPIRATION
IN AIR
is carried out
THROUGH
TRACHEAE
THROUGH
LUNGS
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Natural Science 2. Secondary Education
UNIT
2
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
animal’s tissues with oxygen.
• They lead out of the body through pores called spiracles.
The insect’s
tissues
Spiracle
Trachea
CO2
O2
Exoskeleton
Respiration
through tracheae
in an insect.
Natural Science 2. Secondary Education
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UNIT
2
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 O2
Blood with
CO2
Airways
O2
CO2
Lungs
Respiration through
lungs in a mammal.
Natural Science 2. Secondary Education
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