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The blood vessels** deliver oxygen and nutrients to the tissues in the body. The organs** are surrounded by capillaries** to ensure that all the cells have an equal opportunity for the removal of their waste products and nourishment.



Capillaries surround the organs, making sure that all cells have an equal opportunity for nourishment and removal of their waste products. 


**********respiratory**********

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- The two main gasses exchanged between the lungs and the circulatory system are oxygen and carbon dioxide

- Respiration can be divided into internal and external respiration
- External respiration is the process of air getting in and out of the lungs
- Inspiration occurs when the respiratory muscles contract. The ribcage lifts outwards and upwards, whilst the diaphgram lowers allowing maximum tidal volume.
- Carbon dioxed passes out of the blood supply when it reaches the alveoli because the returning blood has a higher concentration of cardbon dioxide than the inspired air in the lungs
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