Lesson Starter What are arrows A and B pointing to? How does the tube labelled A remain open? What are alveoli? What features of the alveoli make them good for gas exchange? A B

Learning Intention To understand the importance of oxygen in respiration To be able to explain that energy is released during respiration To give examples of how energy is used in your body

Energy Energy can neither be converted nor destroyed- it can only be converted *watch demo*

Why do we need energy?

Why do we need energy? (copy) Our cells need energy for a variety of functions including: Cell division Cell growth Chemical Reactions Muscular Contraction Synthesising large molecules Active transport Transmission of nerve impulses

Energy in Food Three food groups Digestion Fats contain most energy- harder to digest Body uses Glucose for energy

This process occurs in all living things! What is Respiration? http://www.bbc.co.uk/education/guides/zq349j6/revision This process occurs in all living things!

Glucose + Oxygen  Carbon dioxide, water and energy Respiration All living organisms Enzyme controlled Releases energy from food Presence/absence of oxygen Glucose + Oxygen  Carbon dioxide, water and energy CO2 and water= waste, breathe it out Limewater test

Respiration (copy) Respiration is the enzyme controlled chemical reaction which happens in ALL LIVING ORGANISMS in order to release the energy stored in food. Glucose + Oxygen  Carbon dioxide, water and energy We can test for carbon dioxide using lime water- carbon dioxide turns limewater from clear to “milky”

True or False Respiration means breathing. Respiration occurs in all body cells. Respiration gives out oxygen. Carbon dioxide is used up by respiration. Respiration is a chemical process that releases energy. Plants do not respire. More energy is produced when oxygen isn’t present