The heart is a
cone-shaped muscular "pump", lying in the center of the
chest, with its apex pointing to the left and
downward.
The heart is divided
by muscle into left and right sides, each side has two
chambers, the atrium (upper) and the ventricle
(lower). Valves between the chambers allow a
single-direction blood flow. This allows oxygenated
blood supply to the whole body via the aorta.
Common Heart Diseases and
Hypertension
De-oxygenated blood
Oxygenated blood