Saturday, October 9, 2010 ; Circulatory System
Purpose of circulatory system
- To transport oxygen and digested food to all parts of the body.
- To transport carbon dioxide and other waste materials away from all parts of the body.
- To ensure gas exchange is carried out at the lungs
- To allow respiration to take place at different parts of the body as oxygen is required by cells to convert food to energy.
How does it work?
- Heart is a muscle that pumps the blood to all parts of the body via blood vessels.
- Blood carries oxygen from the lungs to the heart and from the heart to other parts of the body for respiration to take place.
- Respiration requires oxygen to convert food to energy at different parts of the body. At the same time, carbon dioxide and water are produced by different parts of the body.
- Blood will transport carbon dioxide away from the other parts of the body back to the heart.
- The heart then sends the blood low in oxygen to the lungs for gas exchange to be carried out.
When exercising
- Heart pumps blood faster in order to deliver more oxygen to different parts of the body for respiration to be carried out faster.
- During exercising, respiration speeds up, more oxygen is used to convert food to energy at different parts of the body.
- At the same time, more carbon dioxide and water are produced by different parts of the body.
- The blood then hurriedly transport them to the heart and then from the heart to the lungs for gas exchange.
Regards,
Mr Wan
posted by Allan at
5:46 PM
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