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SYSTEMS INVOLVED IN NUTRITION

SYSTEMS INVOLVED IN NUTRITION. HOW THE EXCHANGE OF SUBSTANCES TAKES PLACE. • Imagine that this drawing represents a human. Inside our body. • As with all multicellular organisms, most of the cells in our body are not in contact with the external environment. Cells of our body.

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SYSTEMS INVOLVED IN NUTRITION

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  1. SYSTEMS INVOLVED IN NUTRITION HOW THE EXCHANGE OF SUBSTANCES TAKES PLACE

  2. •Imagine that this drawing represents a human. Inside our body •As with all multicellular organisms, most of the cells in our body are not in contact with the external environment. Cells of our body External environment •However, they need to exchange substances with the outside. How do they manage it?

  3. •We will represent them in the drawing like this… • To “help” the cells, our body has various specialised systems for the exchange of substances with the exterior. These are:

  4. The digestive system…

  5. …the respiratory system…

  6. …and the excretory system

  7. the circulatory system (with blood)… •In addition, our organism has two systems which transport substances all around the body:

  8. …and the lymphatic system (with lymph)

  9. SYSTEMS INVOLVED IN NUTRITION HOW THE EXCHANGE OF SUBSTANCES TAKES PLACE

  10. These systems permit the exchange of substances between the cells and the exterior. To find out how the exchange of substances takes place in each one of these systems, CLICK on the buttons. • Exchange of substances in the digestive system • Exchange of substances in the respiratory system • Exchange of substances in the circulatory system and in the lymphatic system • Exchange of substances in the excretory system and in other organs

  11. We ingest food •The digestive system obtains the nutrients contained in food… Nutrients •…and passes them into the transportation systems. Exchange of substances in the digestive system

  12. These systems permits the exchange of substances between the cells and the exterior. To find out how the exchange of substances takes place in each one of these systems, CLICK on the buttons. • Exchange of substances in the digestive system • Exchange of substances in the respiratory system • Exchange of substances in the circulatory system and in the lymphatic system • Exchange of substances in the excretory system and in other organs

  13. We take in air •The respiratory system enables us to take in air from the exterior… Oxygen •… and so the oxygen from the air passes into the blood. Exchange of substances in the respiratory system

  14. These systems, the exchange of substances between the cells and the exterior. To find out how the exchange of substances takes place in each one of these systems, CLICK on the buttons. • Exchange of substances in the digestive system • Exchange of substances in the respiratory system • Exchange of substances in the circulatory system and in the lymphatic system • Exchange of substances in the excretory system and in other organs

  15. Nutrients Oxygen Exchange of substances in the circulatory system and in the lymphatic system •The blood and lymph carry the nutrients and oxygen to the cells throughout the body.

  16. • They produce CO2 and other waste substances, which they expel. These are collected by the transport systems and carried to the systems that expel them from the body. Waste CO2 Exchange of substances in the circulatory system and in the lymphatic system •The cells use the nutrients and oxygen to obtain energy and perform their functions.

  17. These systems permits the exchange of substances between the cells and the exterior. To find out how the exchange of substances takes place in each one of these systems, CLICK on the buttons. • Exchange of substances in the digestive system • Exchange of substances in the respiratory system • Exchange of substances in the circulatory system and in the lymphatic system • Exchange of substances in the excretory system and in other organs

  18. CO2 •The respiratory system takes the CO2 from the blood and expels it in exhalation •Many of the other waste products are collected by the blood and the excretory system and are expelled in the form of urine. Waste Exchange of substances in the excretory system and in other organs • The same is true of the sweat glands, which expel waste in the form of sweat.

  19. All these processes take place at the same time Go to the activities, CLICK Go to the main menu, CLICK

  20. Activities 1. Explain what each one of the arrows represents. To start again, CLICK

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