1. Functions of the Respiratory system

2. P6/ M3

3. To get a PASS: To get a MERIT: The structure of the respiratory system
A labelled diagram of the respiratory system and its application.
A general description of the function of the respiratory system.
The structure of the respiratory system
The function of the respiratory system
Breathing (neural and chemical control)
To get a Pass (P6) you need to:
Describe the structure and function of the respiratory system, the mechanisms of breathing and the respiratory volumes
To get a MERIT:
Same as the above… AND
Explain the function of the respiratory system, including mechanisms of breathing. This needs to show more detail, and give an indication of how each element of the respiratory system is designed to meet it’s function.

4. General description The respiratory system is responsible for:
getting oxygen in to our body
Getting carbon dioxide and other waste products out of our body
All living creatures need Oxygen in combination with food to produce energy and movement.
Every cell of the body needs Oxygen to function
Respiration is the process by which cells receive a constant supply of oxygen and carbon dioxide is removed.

5. General description… The aim of the respiratory system is to get:
Oxygen to the bloodstream
so that the CV system can deliver it to the muscles.
Carbon dioxide out of the bloodstream
All endurance performance relies on
Delivery of Oxygen into the blood stream
Removal of Carbon Dioxide out of the blood
Give a couple of specific examples in your worksheet
General description…
When we exercise: CO2 dissolves within the bloodstream and increases acidity levels. So the respiratory centre in the brain speeds up the rate of breathing to get rid of excess CO2.
So rate of breathing increases due to CO2 levels rising. Not the cells demanding more O2.

6. Diffusion Two different types of diffusion:
Gases move through a process called diffusion
Gas moves from a high concentration to a low concentration
Eg: someone wearing perfume.
In the respiratory system
Two different types of diffusion:
Diffusion of Oxygen into the blood stream, attracted by haemoglobin
Diffusion of Carbon Dioxide out of the blood stream to be excreted by the lungs

7. Diffusion of Oxygen into the blood stream
The alveoli are in constant contact with the capillaries
The air we breath in arrives in the alveoli, rich in Oxygen
The blood arrives from the pulmonary artery very low in oxygen
Following the principle of diffusion, the Oxygen moves across the capillary wall and into the blood stream
It is attracted by the haemoglobin into the red blood cells
The blood returns to the heart to be pumped to the rest of the body

8. Diffusion of Carbon Dioxide out of the blood stream
The blood arrives in capillaries of the lungs with a high concentration of Carbon Dioxide
The air in the alveoli has a low concentration of Carbon Dioxide
According to the principles of diffusion, the Carbon dioxide moves across the wall of the capillaries and into the alveoli, so that it can be expired.