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P wave - atrial systole. This is when both atria of the heart contract, to force blood from the atria to the ventricles. The valves that separates the left atrium and the left ventricle i...

Eukaryotic cells: bigger overall, chromosomes are linear and can be coiled round proteins for folding, larger ribosomes, they contain membrane bound organelles such as the nucleus, mitochondria, chlorolpl...

The scientific term for breathing in is inspiration. The main muscle that helps us to breathe is called the diaphragm; a large, dome shaped muscle that sits below our rib cage. The external intercostal mu...

1. Attraction of phagocyte (neutrophil), towards the bacterium 2) Neutrophil engulfs the pathogen, forming a phagosome3) Formation of lysosomes which are attracted to the phagosome4) Binding of lysosom...

The HIV life style has 7 stages. The first is binding: HIV has glycoproteins embedded in the membrane that help it to bind to CD4 receptors on the surface of a human cell. Next, the HIV envelope and human...