4-2 Organisation


State the name of the blood vessel that brings blood from the legs to the right side of the heart.(Vena Cava)

- A blood vessel carries blood through tissues and organs such as, veins, arteries and capillaries

- The vena cava is a large vein that carries deoxygenated blood into the heart

How do biological detergents cotaining protease enzymes help to remove stains from clothing, and which temperature removes the stains the fastest? (Using a measuring cylinder, measure equal volumes of a detergent solution. Use the dropping bottle to place equal dops of stain onto each piece of cloth. Place the stained cloths and detergent solutions in test tubes. use a water bath to provide a range of temperatures and leave the cloths in the detergent at different temperatures for same length of time. Finally, record the time taken to remove the stain of each cloth and repeat this…


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