B2
- Created by: 05ayesha04
- Created on: 03-01-18 16:25
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- Cell organisation-B2.
- Organs
- Cells are the basic building blocks for all living things.
- A tissue is a group of cells with the same structure and function.
- Organs are groups of specific tissues performing certain jobs.
- Organs are organised into organ systems which work together to form organisms.
- Lock and key theory.
- Chemical reactions usually involve things being joint together or split apart.
- Every enzyme has an active site with a unique shape that fits onto the substance involved in the reaction.
- A catalyst is a substance that speeds up a reaction but doesn't change it.
- Enzymes.
- Amylase- produced in the salivary glands in saliva. Breaks down starch.
- Protease- produced in the pancreas. Break down proteins into amino acids.
- Lipase- produced in the pancreas. Break down lipids to glycerol and fatty acids.
- Carbohydrase- break down carbohydrates to simple sugars.
- The heart and circulatory system.
- The right ventricle pumps blood to the lungs where gas exchange takes place.
- The left ventricle pumps blood around the rest of the body.
- The body contains three types of blood vessel; arteries, veins and capillaries.
- Communicable diseases can be spread from person to person by things like bacteria.
- Non-communicable diseases cannot be spread by contact,e.g. asthma or cancer.
- Cancer.
- Cancer is caused by an uncontrolled cell growth and division.
- Benign tumours are not dangerous but grow until there is no more room.
- Smoking can cause lung, mouth, bowel, stomach and cervical cancer.
- Obesity can cause bowel, liver and kidney cancer.
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- Organs
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