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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 Click on each box to find out more 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 Go back to the Start menu 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 Go back to the Start menu