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The Dodgy BBQ (Science)

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by

Daniel Bower

on 19 June 2013

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Transcript of The Dodgy BBQ (Science)

Just by touching an uncooked burger and then putting your fingers in your mouth can potentially give you food poisoning, so a couple of bites of an uncooked burger would be enough to ensure a few bad stomachs in a few hours.
By cooking the burgers on a high heat for a very short time you are more likely to burn the outside without heating the inside. By heating the food properly then you destroy the bacteria and so prevent food poisoning.
Removing Pathogens
Vomiting and diarrhea are the body's natural way of getting rid of potentially harmful pathogens such as the bacteria found in beef burgers.
The bacteria that entered the guests' bodies
By Daniel Bower
At her birthday garden party, Chloe's dad cooked beef burgers on a barbeque for the guests. Everybody was very hungry and so Chloe's dad cooked the beef burgers quickly. They were burnt on the outside. After a couple of mouthfuls, a few guests complained that their burgers were cold in the middle, so Chloe's dad put them back on the barbeque to heat them through. A few hours later, some of the guests had bad stomach pains and a few vomited. The next day, many of the guests were being sick and had diarrhoea.


Assuming that the guests were feeling ill 4 hours after the burgers were cooked, there would have been 4096 times the amount of bacteria inside them, than when they first ate the meat. Each bacterium can divide every 20 minutes. That is why it took some time before the guests felt ill.
The bacteria was ingested.
An antigen is a substance on the surface of the cell that tells the body that it is a foreign cell.
An antibody is a secondary line of defense of the body, which is produced in response to a foreign antigen.
Antibodies
When we are vaccinated, we are usually injected with dead bacteria. This is so that our bodies produce the necessary antibodies to kill the antigens, and can do so in the future when wanted.
Skin, nose hair, and toenails are our primary line of defense against bacteria. Through ingestion, the bacteria got past the primary line of defense, so only had the secondary line of defense to stop it.
The secondary line of defense
Our secondary line of defense includes antibodies, goblet cells, ciliated epithelial cells, and white blood cells.
White Blood Cell
Bacteria
The white blood cell has a flexible shape to help it to engulf diseased organisms.
Bacteria are 'digested' inside the white blood cell.
Ciliated epithelial cells & Goblet Cells
Ciliated epithelial cells have long 'hairs' which wave along the top which move along the foreign cells which have been covered in mucus by the goblet cell.
The goblet cells produce mucus which surrounds the bacteria, and is then swept away with the ciliated epithelial cells.
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