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Edexcel GCSE PE Respiratory System
Transcript of Edexcel GCSE PE Respiratory System
1.2.3: The Respiratory System
Results Plus Plenary
On completion of this unit you should:
1. Have an overview of the respiratory system and its functions
2. Understand the immediate and short terms effects of exercise/physical activity on the respiratory system.
3. Understand the long term effects of exercise/physical activity on the respiratory system.
Breathing quickens and deepens
Immediate and short term effects of exercise on the respiratory system
increased number of alveoli
Effects of regular participation in and long term benefits of exercise and physical activity
Taking in oxygen and passing out carbon dioxide through gaseous exchange are the vital requirements of the respiratory system.
can have serious adverse effects on this process.
Smoke from cigarettes damages the alveoli, making them less stretchy, causing breakages in the thin walls which then in turn leads to larger less efficient air sacs.
This causes a reduction in oxygen
by the red blood cells - this is also because they instead carry carbon monoxide from the cigarettes in preference to the oxygen.
The effects of smoking on the alveoli and gaseous exchange
(i) During a match a player is likely to build up an oxygen debt. What is an oxygen debt?
(ii) If a player has built up an oxygen debt will they have been working anaerobically or aerobically?
(iii) What by-product is associated with an oxygen debt?
Now watch again and answer the following questions:
1. What do you know about the respiratory system and what it does?
2. Why do you think athletes in events such as the 400m are gasping for breath when they finish?
3. Do all athletes breathe as heavy after an event or training session?
4. Have you ever felt breathless after exercise? Why? What were you doing?
Make notes on the main functions of the respiratory from the following video clip e.g. whats it made up off, what jobs does it do? etc.
Edexcel key terms
The amount of oxygen consumed during recovery above that which
would have ordinarily been consumed in the same time at rest (this
results in a shortfall in the oxygen available).
Tidal volume and vital capacity:
These two measurements help to estimate the efficiency of the respiratory system. It is important to be able to define tidal volume and vital capacity.
is the amount of air inspired and expired with each normal breath at rest or during exercise
is the greatest amount of air that can be made to pass into and out of the lungs by the most forceful inspiration and expiration. Normally around 4-5 litres.
To summarise, the respiratory system has two main functions:
1. To bring oxygen into the body
2. to take carbon dioxide out of the body
(Discuss process a little more)
Oxygen Debt occurs if exercise becomes anaerobic
No matter how fast the heart is beating it cannot provide the working muscles with enough oxygen, if not enough oxygen is reaching the lungs, therefore the body increases this oxygen uptake by taking faster and bigger breaths. The efficiency of breathing depends on how much oxygen can be removed from the air.
increased strength of intercostal muscles
increased strength of the diaphragm
increased lung volume
(due to increased tidal volume and vital capacity)
1. Your respiratory system is stronger
2. You can take in more air and extract oxygen more effectively
3. Therefore you can provide more oxygen to the working muscles
Answers: (i) A lack of oxygen, extra amount of oxygen required after anaerobic exercise compared with whats needed when at rest.
(iii) Lactic Acid