E.g. – It would take 6 million of one of the smallest viruses to make a row just 1 mm long.
1) Sneezing and coughing
2) Dirty skin and hands
3) Unbrushed teeth
4) Being careless when storing, preserving or handling food.
5) Dirty dustbins can attract flies, rats and mice.
6) By touching a person who already has some kinds of illness.
7) Animals like flies carry germs on their legs and mouthparts, can leave germs when they have been feeding.
8) Uncooked food (especially meat) can contain bacteria. The bacteria are killed when the food is cooked properly. But if you eat food that has not been cooked properly, the bacteria may survive and make you feel very ill.
E.g – Mould is a type of micro-organism that grows on decaying food. It can make you ill if you eat it.
1) When the person who has got cold coughs or sneezes, some of the viruses will be shot out into the air.
2) If you breathe in some of these viruses, they will settle in your nose and throat where it is warm and moist.
3) There the viruses will multiply rapidly (quickly) and soon you too will have a cold.
1) Red blood cells
2) White blood cell
Red blood cells
Hemoglobin in red blood cells gives them their colour.
1) They give blood its colour.
2) Hemoglobin in red blood cells carries oxygen all over the body.
White blood cells help to protect us from disease.
1) The white blood cells move in great numbers towards the cut.
2) Then they surround the bacteria and kill them.
3) In doing this, many of the white blood cells die.
4) Their dead bodies form part of the ‘pus’ which comes out of the infected cut, sore or wound.
1) Some of the white blood cells produce chemicals.
2) These chemicals can neutralize, or make harmless, the poisons produced by bacteria.
1) Throughout the year our homes maintain a good flow of air with the outside and we keep the temperature cool.
2) In winter the bacteria and viruses can remain alive or active inside because it is too cold outside.
3) We keep our houses closed up from outside and keep it warm.
4) So the bacteria and viruses survive in these warmer environments and reproduce more and more.
5) Therefore most of the people get sick this time of year.
1) Flu and cold
3) Sore throat
In winter season people travel to visit with family and also there are lots of crowds in public places (like shopping malls) to buy items. This helps spread the illnesses around to other people and places.
To avoid spreading harmful micro-organisms, you must;
February 5, 2013