They’re so small that 2,5 million can fit on a pin head.
The human brain is the central command system for the whole body.The Human Body Systems: The Brain and Nervous System The human body is made to stand erect, walk on two feet, use the arms to carry and lift, and has opposable thumbs (able to grasp). The average height of an adult human is about 5 to 6 feet tall. The human body is made up of a head, neck, torso, two arms and two legs. These systems include the central nervous system, the circulatory system, the respiratory system, the digestive system, the immune system, the reproductive system, the skeletal structure and musculature It is a remarkable biological machine with many systems working together to allow for life, movement, cognitive function, growth, repair, reproduction and so much more. More interesting facts about the human body.
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