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Respiratory system Lesson 5 Respiration.

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Presentation on theme: "Respiratory system Lesson 5 Respiration."— Presentation transcript:

1 Respiratory system Lesson 5 Respiration

2 snulg cnuhorbs xortah gicebra chatare laivole goxeyn damobne Lungs
Thorax Trachea Oxygen Bronchus Ribcage Alveoli Abdomen cnuhorbs xortah gicebra chatare laivole goxeyn damobne

3 Keywords Respiration Aerobic Anaerobic Oxygen debt Combustion

4 Keyword Definition

5 How do cells get oxygen and glucose?
Boardworks KS3 Science 2008 Respiration How do cells get oxygen and glucose?

6 How is digested food used by the body?
Boardworks KS3 Science 2008 Respiration How 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 release energy. 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): carbon dioxide glucose + oxygen + water ( energy) + from the digestive system from the respiratory system waste product (exhaled) waste product (exhaled) This type of respiration is called aerobic respiration because energy is released in the presence of oxygen. Teacher notes This 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 2008 Respiration The equation for aerobic respiration

9 Respiration and combustion
Boardworks KS3 Science 2008 Respiration Respiration and combustion Burning is the reaction between a fuel and oxygen. This reaction is called combustion: fuel + oxygen carbon dioxide + water During 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 2008 Respiration Respiration and combustion

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13 Aerobic and anaerobic respiration
Boardworks KS3 Science 2008 Respiration Aerobic and anaerobic respiration When the body is able to supply its cells with the oxygen and glucose that they need, it carries out aerobic respiration. oxygen carbon dioxide glucose + 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 notes This 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 acid glucose energy +

14 Boardworks KS3 Science 2008 Respiration
Not enough oxygen! + glucose lactic acid energy When 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 Corporation After exercise the body needs to remove the lactic acid before it causes damage to cells.

15 Boardworks KS3 Science 2008 Respiration
Oxygen debt Lactic acid is broken down by oxygen. oxygen water lactic acid carbon 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 Corporation Teachers notes Respiration 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 2008 Respiration How does running affect your pulse?

17 Anaerobic respiration equations
Boardworks KS3 Science 2008 Respiration Anaerobic respiration equations

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.


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