1. Excretion

2. Excretion is the elimination of waste substances from the blood. It’s no the same as the elimination of faeces.

3. Kidneys Thes are in the abdomen, at both sides of the spinal column, they filter the blood and retain waste substances which made up urine. Your kidneys look like 2 giant red beans.

4. Ureters These two tubes carry urine from kidneys to the bladder.

5. Bladder This stores the urine and then expells this from the body. Urethra Urine is expelled through this tube

7. Sweat Sweat is a liquid that our body secretes when our body is very hot or when we exercise. Sweat is formed in the sweat glands in the skin. It consists of water, salts and a small amount of waste substances.

8. game http://www.softschools.com/science/human_ body/urinary_system/ http://www.softschools.com/science/human_ body/urinary_system/