The heart is the pump in charge of keeping up adequate circulation of oxygenated blood around the vascular system of the body. It is a four-chamber pump, with the right side getting deoxygenated blood from the body at low pressure and pumping it to the lungs and the left side accepting oxygenated blood from the lungs and pumping it at high pressure around the body. The myocardium is a particular type of muscle, comprising of individual cells joined by electrical connections. The contraction of every cell is delivered by rise in intracellular calcium concentration leading to spontaneous depolarisation, and as every cell is electrically connected with its neighbour, contraction of one cell prompts to an influx of depolarisation and contraction across the myocardium.
- Track 1-1 Circulatory system
- Track 2-2 Anatomy of the heart
- Track 3-3 Science of heart beat
- Track 4-4 Blood flow in heart