Biology

Biology

1. Healthy Diets

   • Correct balance of different food groups.
     • Carbohydrates
     • Fats
     • Proteins
     • Fibre
     • Vitamins
     • Water
   • A poor diet can lead to diabetes, overweight or underweight.
   • Exercise
   • Metabolic Rate
     • The time it takes for chemical reactions in the cells of your body to take place.
     • Can be affected by inherited factors such as Cholesterol.

2. Vaccinations

   • This gives immunity to the particular disease.
   • Pathogen is injected into the body. The antibodies produced by the white blood cells destroy the pathogen.

3. Bacteria And Viruses

   • Bacteria
     • Very Small
     • Reproduces very quickly
   • Viruses
     • Smaller than bacteria.
     • Can reproduce very quickly once there are inside living cells.
   • Treatment Against Diseases
     • Antibiotics are used to kill bacteria.It can not be used to kill viruses.
     • Some bacteria have developed resistance to antibiotics, because of inappropriate use of antibiotics.

4. Nerves

   • Nervous System
     • Consists of the brain, spinal cords, the neurones and receptors.
     • Help organism to response and coordinate.
     • Information from the receptor passes along the neurones to the brain. The brain produces impulse and send to the effector.
       • The effector may be a muscle or a gland.
   • Neurons
     • Motor Neurone. Sensory Neurone. Relay Neurone. These are cells that can carry an electrical signal (impulse).
   • Types Of Receptors
     • Light
     • Sound
     • Taste
     • Smell
     • Touch, Pressure, Pain and Temperature
   • Stimulus > Receptor > Sensory Neurone > Relay Neurone > Motor Neurone > Effector > Response.