1. The Excretory System

2. Review
Chemical reactions take place within the body known as metabolic reactions.
Metabolic reactions produce wastes
The excretory system in the human body is responsible for eliminating the metabolic waste urea from the body
Excretion and egestion are different process in the human body.

3. Label The Excretory System

4. The Kidneys
Has 3 main parts:
The cortex
Medulla
Pelvis

5. Label the Kidney

6. Functions of the Kidney
The kidney filters waste products from the blood and passes this out of the body
It also controls the amount of water and salts in the body

8. Objective: To describe the composition of urine

9. Urine Composition Urine is made up of: Water (largest component) Urea
Mineral Salts (mainly sodium chloride)
Other waste products

10. Kidney Stones
One common and painful kidney disorder is kidney stones, which are small crystals (made up of substances such as calcium) formed in the kidney
It is mainly caused by not drinking enough water.

11. Dialysis
Objective: To describe dialysis

12. The Liver Objective: To describe the function of the liver
Large, red/ brown organ
Below the diaphragm
Largest organs in the body (over 1kg)

13. Functions of the Liver Produces bile which helps to: digest fat
Excretes bile pigments (produced from hemoglobin breakdown)
2. Detoxifies harmful substances such as alcohol and drugs by chemically altering them