THE HEART Thick muscular rhythmically contracting organ consists of 4 chambers (2 atria & 2 ventricles). The heart is a modified blood vessel that serves as a double pump and consists of four chambers. ... Read more

THE CELL DEFINITION: The cell is the structural and functional unit of the living organism. The cells are organized together to form tissues. The tissues are combined to form organs. Several organs having interrelated ... Read more