How does the human head work?
The human body consists of trillions of cells organized into several organs and systems such as head, neck, shoulders, arms, legs, torso, hips, thigh, Knee, ankle, foot, fingers etc. Head, arms, legs and torso also have several internal and external organs in each. The systems at work are- Respiratory, circulatory, endocrine, digestive, nervous, skeleton and reproductive etc. All these systems work together to make human body alive.