Some types of cancer can cause the numbers of blood components in a person’s body to fall to a dangerously low level. A person with one of these types of cancer may experience symptoms such as: • tiredness • frequent infections • bleeding that will not stop after the skin is cut. Explain how a very low number of blood components in the body can cause these symptoms. – 7017

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1. Tiredness:
   There are fewer red blood cells, so less oxygen is carried around the body. This means less energy is made from aerobic respiration. The body uses more anaerobic respiration instead, which makes lactic acid and causes muscles to feel tired.
   Frequent infections:
   There are fewer white blood cells, so fewer antibodies are made and fewer germs are destroyed. This makes it easier to get infections.
   Bleeding:
   There are fewer platelets, so blood doesn’t clot as well. This means bleeding takes longer to stop.

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