Human Organ Systems

Human Organ Systems

Human Organ Systems

Humans have nine major organ systems which make the seven life processes:

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

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

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 Endocrine System

  • This system produces and discharges chemicals called hormones
  • A number of glands around the body (endocrine system) produce these hormones
  • Hormones control activities such as growth or sexual characteristics and also bodily functions like menstruation

8) 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

9) The Muscle System

  • Muscles are attached to bones
  • Muscles cause movement when they contract and relax
  • Muscles are a bit like fading hippies - you usually find them in pairs around a joint
Human Biology

Blood and Blood Vessels

Blood and Blood Vessels

The contents of blood including red blood cells, white blood cells, platelets and plasma

Human Biology

Diseases caused by smoking

Diseases caused by smoking

Diseases caused by smoking including Emphysema and Bronchitis

Human Biology

Enzymes

Enzymes

Human Biology

Excretion and Osmo-Regulation

Excretion and Osmo-Regulation

Human Biology

Food

Food

Human Biology

Carbohydrates

Carbohydrates