Archive for February 24th, 2009
The heart is a muscular organ with four chambers, designed to work efficiently, reliably, and
Tuesday, February 24th, 2009The heart is a muscular organ with four chambers, designed to work efficiently, reliably, and continuously over a lifetime. The muscular walls of each chamber contract in a regulated sequence, pumping blood as required by the body while expending as little energy as possible during each heartbeat.