Excretory system

Excretory system- agrega2
1. Excretory system organs.
1.1 Excretion.
1.2 The excretory system.
1.3 Sweat glands.

2 How the kidney works.
2.1 The kidney

3 The skin
3.1 The skin function.
3.2 Test

4 The urination process
4.1 The urination process
4.2 The urinary system.
4.3 The kidneys and the urinary tracts.

Excretory system