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Human Body: Organs What happens inside the ear? Where is the voice box? What are alveoli? How do we taste and smell? What are the main parts of the brain? What does the liver do? How do our eyes work? How often does the heart beat? How do we breathe? What does the heart do? What is an organ? What are the senses? Why do we need kidneys?   Previous: Back to Human Body: Organs Book: 1001 Section: Human World Chapter: Human Body: Organs