5 How do cells get oxygen and glucose? Boardworks KS3 Science 2008RespirationHow do cells get oxygen and glucose?
6 How is digested food used by the body? Boardworks KS3 Science 2008RespirationHow is digested food used by the body?The body needs a constant supply of energy which comes from digested food.Glucose, from digested carbohydrates, is an important substance that contains stored chemical energy.When glucose reacts with oxygen, a lot of energy is released.In the body’s cells, glucose and oxygen react to releaseenergy. Some of this is released as heat and the rest is used by the cells.What is the release of energy from glucose called?
7 Boardworks KS3 Science 2008 Respiration What is respiration?Respiration is the process that the body uses to release energy from digested food (glucose):carbondioxideglucose+oxygen+water( energy)+from the digestive systemfrom the respiratory systemwaste product (exhaled)waste product (exhaled)This type of respiration is called aerobic respiration because energy is released in the presence of oxygen.Teacher notesThis could be a good place to make sure pupils understand that respiration is not the same as breathing and ventilation.How do the glucose and oxygen needed for aerobic respiration get to the all the body’s cells?
8 The equation for aerobic respiration Boardworks KS3 Science 2008RespirationThe equation for aerobic respiration
9 Respiration and combustion Boardworks KS3 Science 2008RespirationRespiration and combustionBurning is the reaction between a fuel and oxygen. This reaction is called combustion:fuel+oxygencarbon dioxide+waterDuring combustion, heat and light energy are released and carbon dioxide and water are also produced, so combustion is similar to respiration.The difference between combustion and respiration is that combustion is not a controlled reaction. Respiration is a controlled reaction that slowly releases energy from food in the body’s cells and the cells do not catch fire!
10 Respiration and combustion Boardworks KS3 Science 2008RespirationRespiration and combustion
13 Aerobic and anaerobic respiration Boardworks KS3 Science 2008RespirationAerobic and anaerobic respirationWhen the body is able to supply its cells with the oxygen and glucose that they need, it carries out aerobic respiration.oxygencarbondioxideglucose+water( energy)When the body cannot supply the cells with the oxygen needed to break down glucose, then it has to carry out anaerobic respiration. Energy is released without oxygen:Teachers notesThis may be a good place to make sure the students understand that anaerobic respiration does not replace aerobic respiration. Only cells that require more energy, such as muscle cells, will carry out anaerobic respiration if there’s not enough oxygen present.lactic acidglucoseenergy+
14 Boardworks KS3 Science 2008 Respiration Not enough oxygen!+glucoselactic acidenergyWhen anaerobic respiration takes place, lactic acid is also produced.Lactic acid builds up in the muscle cells and prevents the muscles doing their job. This is thought to cause fatigue and sometimes cramp.Photo credit: Jupiterimages CorporationAfter exercise the body needs to remove the lactic acid before it causes damage to cells.
15 Boardworks KS3 Science 2008 Respiration Oxygen debtLactic acid is broken down by oxygen.oxygenwaterlactic acidcarbon dioxide+After activity that has lead to anaerobic respiration, the person involved breathes heavily and their heart rate remains high to supply the body with the oxygen it needs.Photo credit: Jupiterimages CorporationTeachers notesRespiration Worksheet 3 accompanies this slide.The amount of oxygen needed to remove all the lactic acid after exercise is called an oxygen debt.
16 How does running affect your pulse? Boardworks KS3 Science 2008RespirationHow does running affect your pulse?
18 LO –Level 4 – To state the differences between inhaled and exhaled air.To state where oxygen gets into the blood and how it is transported around the body.Level 6 – To explain how oxygen gets into the blood.Level 7 – To explain how the lungs are adapted to their job.