OCR Gateway B- B1
- Created by: Harriet_Rose_Bingham
- Created on: 08-05-17 16:12
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- Biology 1
- Drugs and Disease
- Harmful drugs are class A, B and C. Class A is the most harmful.
- Depressant and stimulant drugs affect the nervous system by affecting the transmission across synapses.
- Changes in lifestyle can reduce the risk of some cancers.
- The mosquito is a vector that carries malaria.
- Plasmodium is the pathogen that causes malaria. It is a parasite and humans are it's host.
- Immunisation protects against certain diseases by using harmless pathogens.
- Diet and exercise
- Smoking, a high alcohol intake a a diet rich in saturated fats and salt increase blood pressure.
- High blood pressure can damage the brain and kidneys.
- BMI can be used to indicate being over or underweight.
- Plant hormones and homeostasis
- Auxins cause shoot curvature by cell elongation.
- Auxins are gravity and light sensitive.
- Automatic systems in the body keep water, temperature and carbon dioxide levels constant.
- Insulin controls blood sugar levels. It converts excess blood glucose into glycogen.
- The nervous system
- The eye accommodates by altering the shape of the lens.
- A nerve impulse travels along the axon of a neurone.
- Variation and inheritance
- Alleles are different versions of the same gene.
- **- Female XY- Male
- Human body cells have 23 pairs of chromosome.
- Being homozygous is having two identical alleles, being hetrozygos is having two different alleles.
- Drugs and Disease
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