First Children Encyclopedia

Your amazing body Anatomy.^99 Being human Although we look different from animals, our bodies are similar on the inside. Our clo ...

How many genes are there in each cell in the human body? Human body 100 All human bodies work the same way, but everyone is diff ...

What makes you you? About 30,000 specific genes.^101 DNA Your genes are stored in a chemical called DNA, which looks like a twis ...

How many cells are there in the human body? Human body 102 Every part of your body is made of tiny building blocks called cells, ...

Building blocks About 100 trillion.^103 Fat cells are bubble shaped. They store fat under your skin. Many blood cells are red. T ...

Which body system makes your stomach rumble? Human body 104 Your cells and tissues are organized into larger body parts called o ...

Organizing the body The digestive system.^105 Breathing system: the main organs are your lungs, which take in air. Hormone syste ...

106 You would be like a lump of jelly without your skeleton – a frame of bones that holds you up and protects your internal orga ...

107 Muscle magic Muscles are rubbery, stretchy straps. You can control some of your muscles, like the muscles in your arms and l ...

Do clever people have bigger brains? Human body 108 Your brain is the part of your body that makes you think, feel, and remember ...

Brain and senses No. Everyone’s brain is about the same size.^109 Skin and touch Nerves in your skin tell you if things feel har ...

Breathing How many breaths do you take in a day? Human body 110 We have to breathe all the time in order to supply our bodies wi ...

Breathing About 23,000.^111 Windpipe Air from your mouth and nose enters your windpipe, which goes down your throat into your ch ...

How many dead-skin flakes fall off every day? Human body 112 All about skin Two layers Your skin has two main layers. The top on ...

All about skin About ten million.^113 Cooling down When sweat dries on your skin, it helps to cool you down. Sweat comes from co ...

Which is your largest defensive organ? Human body 114 Although you can’t see them, germs are always landing on your body and try ...

Body defences Your skin.^115 Acid attack Glands inside your stomach make acid, which kills germs you’ve swallowed. Your digestiv ...

Why does your stomach rumble? Human body Your body needs food to keep it working. But before it can use the food, it breaks it i ...

Eating and digestion Because of air mixed up with your food.^117 Protein in milk helps Carbohydrates you to grow and to repair y ...

What is another name for the uterus? Human body 118 The first cells After 36 hours, the cell has divided and made an exact copy ...