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Mitosis is a form of cell division in which one cell (mother cell) divides into 2 genetically identical cells (daughter cells). Within the human body, mitosis replaces worn-out cells with new cells. Mitos...

A niche is the functional area within which an organism exists. This can be a specific habitat it inhabits, how it shelters itself, a food source it can exploit and can include all abiotic or biotic inter...

Electrons and H+ ions are donated to the electron transport chain (located in the inner mitochondrial membrane) from NADH and FADH2 (generated during glycolysis, the Krebbs cycle and the Link reaction). T...

The cardiac cycle is the continual sequence of contraction and relaxation of the atria and ventricles to keep blood continually circulating around the body.

First the atria contract decreasing thei...

Arteries carry blood away from the heart to the rest of the body and veins then take blood back to the heart. Because the heart directly pumps blood into the arteries by its forceful contractions, arterie...