Your skin is the largest organ in the human body., The human brain contains about 86 billion nerve cells called neurons., Your heart beats around 100,000 times every day., Bones are stronger than concrete for their weight., The stomach produces strong acid to help break down food., Humans have 206 bones in their adult bodies., Your blood vessels would stretch for thousands of kilometers if laid end to end., The liver can regenerate, which means it can regrow damaged tissue., You use many different muscles in your face just to smile., The small intestine is much longer than the large intestine., Your body has five main senses: sight, hearing, smell, taste, and touch., Fingerprints are unique, so no two people have exactly the same ones.

Unit 12

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