The human heart weights about 300 g and is situated in the middle region of the thorax . The lower border of the heart , known as the apex, points towards the left of the thorax.

From the moment it begins beating until the moment it stops, the human heart works tirelessly. In an average lifetime, the heart beats more than two and a half billion times, without ever pausing to rest. Like a pumping machine, the heart provides the power needed for life.