Describe the basic anatomy of the human heart, including its location, chambers, and valves.

The heart is located in the mediastinum, the central compartment of the thoracic cavity, between the lungs. It rests on the diaphragm, slightly to the left of the midline.

The heart has four chambers: two upper atria (right and left atrium) that receive blood, and two lower ventricles (right and left ventricle) that pump blood out of the heart.

The heart contains four valves that ensure unidirectional blood flow:

• The tricuspid valve (between right atrium and right ventricle).
• The pulmonary valve (between right ventricle and pulmonary artery).
• The mitral valve (between left atrium and left ventricle).
• The aortic valve (between left ventricle and aorta).

The heart is positioned in the mediastinum, slightly to the left. It has four chambers: the right atrium, right ventricle, left atrium, and left ventricle. There are four valves: tricuspid, pulmonary, mitral, and aortic, which regulate blood flow.

$\boxed{\text{The heart is located in the mediastinum, slightly to the left. It has four chambers: right atrium, right ventricle, left atrium, and left ventricle. It contains four valves: tricuspid, pulmonary, mitral, and aortic, which ensure unidirectional blood flow.}}$