The respiratory system: aerobicGCSE PE

Aims:0Know the parts that make up the

respiratory system.0Know the action of breathing0Understand aerobic respiration.0Understand the process of

gaseous exchange.

The respiratory system…

Key words:Match to the correct definition

Key word Definition

0 Gaseous exchange:0 Alveoli:0 Intercostal muscles0 Sternum:

0 The chest or breastbone.0 The process where oxygen is

taken in from the air and exchanged for carbon dioxide.

0 Small air sacs in the lungs where gaseous exchange takes place.

0 Abdominal muscles in-between the ribs which assist in the process of breathing.

Key words:Match to the correct definition

Key word Definition

0 Gaseous exchange:0 Alveoli:0 Intercostal muscles0 Sternum:

0 The chest or breastbone.0 The process where oxygen is

taken in from the air and exchanged for carbon dioxide.

0 Small air sacs in the lungs where gaseous exchange takes place.

0 Abdominal muscles in-between the ribs which assist in the process of breathing.

Nasal Cavity

MouthPharynx (throat)

Larynx (voice box)

Trachea (wind pipe)

Lung

Right Bronchus

Left Bronchus

Bronchioles

AlvioliDiaphragm

Gaseous exchange:

The action of breathingRe-order sentences to make sense:0 As this is happening, the intercostal muscles raise the ribs

up and push out the sternum, which makes the cavity larger.0 The air we are actually breathing in is high in oxygen and

nitrogen but low in carbon dioxide.0 This serves to reduce the pressure inside the chest cavity

and causes air to be sucked into the lungs.0 When we breath in, the chest cavity changes shape and size

– the diaphragm changes from a dome shape as it flattens and moves downwards.

0 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:0 When we breath in, the chest cavity changes shape and size

– the diaphragm changes from a dome shape as it flattens and moves downwards.

0 As this is happening, the intercostal muscles raise the ribs up and push out the sternum, which makes the cavity larger.

0 This serves to reduce the pressure inside the chest cavity and causes air to be sucked into the lungs.

0 The air we are actually breathing in is high in oxygen and nitrogen but low in carbon dioxide.

0 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:

0Summarised as:0 Respiration that occurs in the presence of oxygen.0 Glucose + oxygen = energy (+ carbon dioxide + water)

0 Used when the body continues to exercise for a long period of time.

0 When the energy to do so is produced using oxygen.0 To work efficiently, there has to be a constant supply of

oxygen.0 Important for any activity going to be performed for

sustained period of time.

Breathing rate:

Facts: Challenge:

0Breathing rate increases greatly when we exercise. It can increase up to three times the rate when we are at rest.

0Count breaths per minute at rest.

0Run on the spot for 2 minutes.

0Count breathing rate.

0Any difference?

Grade the answers:

0Question: Explain what happens to breathing rate when we exercise. (2 marks)

0Answer: It gets bigger

How many marks?Can you write a better answer?

Grade the answers:

0Question: Explain gaseous exchange (1 mark)

0Answer: 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.

How many marks?Can you write a better answer?

Grade the answers:

0Question: What is aerobic respiration (3 marks)

0Answer: This is respiration that occurs when oxygen is present. It is important for short activities, like shot putt.

How many marks?Can you write a better answer?