The human body is the structure of a human being. It is made up of many different types of cells, which in turn create tissues and organs.
To make it easier to understand, scientists typically study specific parts of the human body, separated into these groups, or systems:
It would take about 650 AA batteries to power a human being for a single day.
The smallest bone in the human body is located deep inside the ear. Known as the stirrup, it measures around 3 mm in length, or about half the size of a grain of rice.
A human blood cell can circulate through the entire body in about one minute.
The human body contains enough carbon to fill about 9,000 pencils.
The average human body carries nearly ten times as many bacterial cells as human cells.
Humans produce about 30 mL of saliva every hour. That means that the typical person makes about 20,000 L of saliva in their lifetime, or enough to fill 66 standard bathtubs.
The heaviest human brain on record had a mass of just over 2.3 kgâ€“â€“the mass of your typical bag of flour from the grocery store.