Biology B2

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Animal and Plant Cell


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Bacterial Cell


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Yeast Cell


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How Dissolved Substances Pass Through The membrane

Oxygen and Food go in ->

(>Waste products and carbon dioxide come out.

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Rapid diffusion from the high concentration to the low concentration.


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Stomach Tissues

An organ is made up of different tissues that working together to do one job.

  • Muscular tissue - to churn the food and other contents of the stomach
  • Glandular tissue - to produce digestive juices including acid and enzymes
  • Epithelial tissue - to cover the inner and outer surfaces of the stomach
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Organ Systems

1) The Digestive System

  • Digestion breaks down food into simpler
  • substances so it can be used and absorbed into the body
  • It takes place in the alimentary canal, (food tube), mainly in the stomach and small intestine
  • Digested food is absorbed into the blood system

2) The Respiratory System

  • This is for taking in oxygen and removing waste carbon dioxide
  • Air enters the lungs by movement of the rib muscles and diaphragm
  • Oxygen is absorbed into the blood system

3) The Excretory System

  • This removes toxic and other waste materials from the body.
  • Waste material is filtered out of the blood by the kidneys and made into urine
  • This is stored in the bladder and released via the urethra
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Organ Systems

4) The Circulatory System

  • The heart pumps blood around the body
  • It supplies cells with oxygen and food, then carries away the wastes like carbon dioxide

5) The Reproductive System

  • This is for producing offspring
  • Eggs are produced by the ovaries in a female
  • Sperm are produced by the testes of a male and they then endeavour to fertilise the eggs
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Organ Systems

6) The Nervous System

  • The five sense organs are: eyes, ears, nose, tongues, skin
  • They all contain nerves, which send messages to the brain about what's happening
  • The brain produces a response, which it sends via other nerves to the muscles

7) The Skeletal System

  • There are 206 bones in the human body and their main job is support
  • Some bones (e.g. the skull) provide a tough barrier to protect delicate organs like the brain
  • Muscles are attached to the bones which contract and relax allowing movement
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