Biology Unit one
- Created by: kerisecarter
- Created on: 31-03-16 10:57
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- biology unit 1
- healthy diet
- A healthy diet contains the right amount of nutrient and if they don't get this they become malnourished
- metabolic rate is the rate that the chemical reactions happen.
- The body gains energy by eating food then it is used up during exercise
- Inherited factor are not lifestyle factors but it can affect your health.
- disease and drugs
- bacteria may release toxins that make us feel ill.
- viruses take over body cell's DNA and cause the cells to make toxins.
- microorganim that cause disease are called pathogens
- the immune system helps to protect the body against pathogen
- thalidomide and statins are medical drugs
- a recreational drug is a drug that people use for its effect rather than for medical reasons.
- responses and receptors
- humans react to their surroundings using their nervous system
- nerves contain nerve cells that connect the central nervous system to the receptors
- reflex actions are automatic so they take no conscious thought
- Internal conditions in the body are controlled so the body work properly
- The menstrual cycle in women is controlled by several hormones
- environment
- plants compete for light and water
- animals compete for food, territory and mates for reproduction
- animals in cold weather.
- small ears white colour large feet thick fur and fat
- animals In warm weather have
- large ears small feet thick coat
- the source of energy for most food chains is light energy from the sun
- decay is the breakdown of materials by microorganim
- the constant cycle of carbon between air and living orgaism is the carbon cycle
- genes
- genes are what make up your DNA
- reproduction
- asexual is when only one parents gametes are used
- sexual is with two peoples gametes are used
- genetic engineering produces genetically modified organisms
- Evolution
- change over time
- Darwin's theory
- A new form of genes occur due to mutation
- Lamarck's theory
- He thought evolution was due to inherited characterises due to the environment
- healthy diet
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