Biology Revision for "O" level examinations

In the video below, the process of Mitosis is explained. 

Red Blood cells/erythrocytes -they are formed in red bone marrows of the ribs, skull and vertebrae -survive for approximately 120 days and are then destroyed in the liver and spleen Structure and Function -contains no nucleus: this allows more room for haemoglobin (also: cells cannot divide/reproduce ) -they have biconcave disc shape to increase surface area -contains hemoglobin that allows the transport of oxygen White Blood cells/Leucocytes a. Phagocytes Function: They engulf and digest invading bacteria and viruses.   Structure:             -their shape may vary             -they move using pseudopodia             -its nucleus is lobed shape             -they are formed in...

Hello everyone. Most of the contents be be posted on my new website. I will also be placing past examinations papers on my new website. Link : http://www.biologynotes101.com/index.html