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The main structures in an animal cell are: The cell membrane- the membrane found around the outside of the cell, some substances can cross it to move in and out of the cell (this means it is semi-permeabl...

• SAN send a wave of depolarisation/excitation across the atria causing them to contract• wave cannot pass directly to the ventricle, due to the non-conductive tissue of AV-valves• wave reaches the AVN (i...

Starch is a polymer of the sugar glucose, an important component of respiration and needed to provide plants with energy. Unlike glucose, starch is insoluble allowing it to be stored within the cell witho...

The heart has 4 main chambers; the right and left atrium, and the right and left ventricle. Each receive blood and pump blood from and to different parts of the body. The right atrium receive de-oxygenate...