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First, the blood enters through the right and left atria. The atrioventricular valves are closed, so the blood pools up inside them. Then, the sinoatrial node (SAN) sends a pulse for the atria to contract...

The nerve impulse will reach the end of the presynaptic neuron, where voltage-gated calcium channels are opened due to depolarisation. Calcium ions then diffuse into the presynaptic neuron, resulting in v...

Embryonic growth requires cell division and the subsequent synthesis of new tissue. This invariably requires energy and raw materials to progress. Phosphate is an important component of ATP, which acts as...

Osmosis can be explained as the passing of water molecules across a partially permeable membrane from an area of high concentration of water molecules to an area of low concentration of water molecules.If...

Cells are the smallest structural and functional units of an organism. Which means an organism can consist of a single cell or multiple cells. Usually cells are microscopic which means they can not be see...