The respiratory system: aerobic GCSE PE

Aims: Know the parts that make up the respiratory system. Know the action of breathing Understand aerobic respiration. Understand the process of gaseous exchange. Aims: The respiratory system…

Key words: Match to the correct definition Gaseous exchange: Alveoli: Intercostal muscles Sternum: The chest or breastbone. The process where oxygen is taken in from the air and exchanged for carbon dioxide. Small air sacs in the lungs where gaseous exchange takes place. Abdominal muscles in-between the ribs which assist in the process of breathing.

Key words: Match to the correct definition Gaseous exchange: Alveoli: Intercostal muscles Sternum: The chest or breastbone. The process where oxygen is taken in from the air and exchanged for carbon dioxide. Small air sacs in the lungs where gaseous exchange takes place. Abdominal muscles in-between the ribs which assist in the process of breathing.

Nasal Cavity Mouth Pharynx (throat) Larynx (voice box) Trachea (wind pipe) Lung Right Bronchus Left Bronchus Bronchioles Diaphragm Alvioli

Gaseous exchange:

The action of breathing Re-order sentences to make sense: As this is happening, the intercostal muscles raise the ribs up and push out the sternum, which makes the cavity larger. The air we are actually breathing in is high in oxygen and nitrogen but low in carbon dioxide. This serves to reduce the pressure inside the chest cavity and causes air to be sucked into the lungs. When we breath in, the chest cavity changes shape and size – the diaphragm changes from a dome shape as it flattens and moves downwards. When we breathe out the reverse process occurs but the air breathed out is high in nitrogen and carbon dioxide as the full process of gaseous exchange has taken place.

Answers: Re-order sentences to make sense: When we breath in, the chest cavity changes shape and size – the diaphragm changes from a dome shape as it flattens and moves downwards. As this is happening, the intercostal muscles raise the ribs up and push out the sternum, which makes the cavity larger. This serves to reduce the pressure inside the chest cavity and causes air to be sucked into the lungs. The air we are actually breathing in is high in oxygen and nitrogen but low in carbon dioxide. When we breathe out the reverse process occurs but the air breathed out is high in nitrogen and carbon dioxide as the full process of gaseous exchange has taken place.

Aerobic respiration: Summarised as: Respiration that occurs in the presence of oxygen. Glucose + oxygen = energy (+ carbon dioxide + water) Used when the body continues to exercise for a long period of time. When the energy to do so is produced using oxygen. To work efficiently, there has to be a constant supply of oxygen. Important for any activity going to be performed for sustained period of time.

Breathing rate: Facts: Challenge: Breathing rate increases greatly when we exercise. It can increase up to three times the rate when we are at rest. Count breaths per minute at rest. Run on the spot for 2 minutes. Count breathing rate. Any difference?

Question: Explain what happens to breathing rate when we exercise Question: Explain what happens to breathing rate when we exercise. (2 marks) Answer: It gets bigger Grade the answers: How many marks? Can you write a better answer?

Question: Explain gaseous exchange (1 mark) Answer: This is the process where oxygen is taken in from the air and exchanged for carbon dioxide. This is necessary as we need a constant supply of oxygen in our body but don’t require carbon dioxide as it’s a waste product. Grade the answers: How many marks? Can you write a better answer?

Question: What is aerobic respiration (3 marks) Answer: This is respiration that occurs when oxygen is present. It is important for short activities, like shot putt. Grade the answers: How many marks? Can you write a better answer?