13:05 | 1,8 КБ/с 96 ©ō urait.ru/viewer/angliys 29 Blood Groups If an adult suddenly loses a litre or more of blood he may die unless the blood in his body can be replaced. Over the years, blood transfusions have saved countless lives. Transfusions can

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Blood Groups
If an adult suddenly loses a litre or more of blood he may die unless the blood in his body can be replaced. Over the years, blood transfusions have saved countless lives. Transfusions can also help patients who cannot produce enough blood cells to survive. They also help during operations when patients lose some blood.

Blood banks collect blood from donors and put it in sterile bags. It is cooled down and can be stored for up to 50 days. Laboratory workers screen blood for infectious diseases like AIDS and hepatitis. Only clean and safe blood can be given to patients.

When a person suffers from anaemia there are not enough red blood cells to supply the body with the oxygen he needs. Leukaemia is a kind
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of cancer of the bone marrow, in which not enough or abnormal white blood cells are produced. Without white blood cells diseases can enter your body without being controlled.

When your body does not have enough platelets blood cannot clot well. Even small injuries can lead to a loss of blood because bleeding doesn't stop.

Exercise 6. Read the text "Blood". Consider if the following statements are TRUE or FALSE. Correct the false ones.
\begin{tabular}{|l|l|l|l|}
\hline Statement & True & False & Correction \\
\hline 1. Blood carries substances we don't need away from us. & & & \\
\hline 2. Plasma is the solid part of our blood. & & & \\
\hline 3. Red blood cells contain haemoglobin, a protein that carries oxygen to the body. & & & \\
\hline 4. White blood cells are more numerous than red blood cells. & & & \\
\hline 5. Platelets are bigger than red blood cells. & & & \\
\hline 6. Oxygen is picked up by haemoglobin in the lungs and transported to the whole body. & & & \\
\hline 7. Food is not transported by blood. & & & \\
\hline 8. White blood cells fight off viruses and harmful bacteria. & & & \\
\hline 9. Blood carries hormones to places where they are needed. & & & \\
\hl