The brain is the central organ of the nervous system and arguably the most complex organ in the human body. Located within the skull, it serves as the command center, coordinating and regulating all bodily activities and functions.

The heart is a vital organ in the human body, responsible for pumping blood throughout the circulatory system. Located in the chest cavity, it functions continuously to supply oxygen and nutrients to all tissues and organs.

​The lungs are essential organs in the human respiratory system responsible for the exchange of oxygen and carbon dioxide between the air we breathe and our bloodstream. They consist of a complex network of airways, bronchi, and tiny air sacs called alveoli, where this gas exchange takes place.