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πŸ«€ My body and food πŸ«€ Body organs

The human body

The muscular system has more than 600 muscles and makes up about 40% of body weight. Muscles can contract, and by contracting they let the body move. The skeleton has more than 200 bones and makes up about 18% of body weight. It gives the body a strong frame.
The muscular system has more than 600 muscles and makes up about 40% of body weight. Muscles can contract, and by contracting they let the body move. The skeleton has more than 200 bones and makes up about 18% of body weight. It gives the body a strong frame.

πŸ“– In short

The human body is a marvel of precision and order. It has many systems working together at the same time, like a team: one digests food, one pumps blood, one breathes, and one thinks and controls. And they're all built from tiny units called cells.

🀩 Did you know?

  • Your body has a huge number of billions of cells.
  • The body's blood vessels make a network about 97000 kilometers long.
  • Water makes up more than half of the human body's weight.
  • Some joints never move, like those between the skull bones.

πŸ”Ž Find out more

🌟 From cell to body

Tiny cells group together to make tissues, tissues make organs like the heart and stomach, organs work together to make systems, and all the systems make the body.

πŸ” Skeleton and muscles

The skeleton holds up and protects the body, and the muscles attached to the bones move it. Joints let the bones bend and turn.

πŸ’‘ Inside systems

The respiratory system takes in oxygen, the circulatory system carries it in the blood, the digestive system turns food into nourishment, and the nervous system sends messages and controls everything.

🎯 The five senses

We know the world around us through our senses: we see with our eyes, hear with our ears, smell with our nose, taste with our tongue and feel with our skin.

πŸ“Έ More pictures

The human eye, like many parts of the body, adjusts quickly to change. In a dark room the pupil widens to let in more light, and if the lights are switched on, the pupil shrinks by itself within seconds.
The human eye, like many parts of the body, adjusts quickly to change. In a dark room the pupil widens to let in more light, and if the lights are switched on, the pupil shrinks by itself within seconds.
The brain is one of the most complex parts of the body. Its outer surface is made of more than eight billion cells. A few of them are shown in the circle.
The brain is one of the most complex parts of the body. Its outer surface is made of more than eight billion cells. A few of them are shown in the circle.
A microscope view of skin showing bacteria as tiny green balls. Countless bacteria live on skin. They're harmless unless they get into the body through a scratch.
A microscope view of skin showing bacteria as tiny green balls. Countless bacteria live on skin. They're harmless unless they get into the body through a scratch.

🧩 Test yourself

1 What is the smallest unit the body is built from?

2 Which organ do we taste food with?

3 The body's blood vessels make a network about ?? kilometers long.

4 Which picture shows β€œThe human body”?

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