Digestion is your body’s way of turning food into energy. It starts in the mouth, where teeth break food into smaller pieces and saliva begins to soften it. In the stomach, strong juices mix and mash the food into a smooth paste. The small intestine absorbs nutrients that help you grow, think, and play. What the body cannot use moves into the large intestine and leaves as waste. Drinking water and eating fruits and vegetables help this system work smoothly.
Comprehension Check
Where does digestion begin?
What is the main job of the small intestine?
Brain, Nerves, and Signals
Your brain is the control center of your body. It sends messages through thin wires called nerves to help you move, feel, and think. When you touch something hot, nerves race a warning to your brain, and you pull your hand away quickly. Practice helps the brain and nerves work together better, like when you learn a song or ride a bike. Sleep gives the brain time to sort memories and rest so you can focus the next day.
Comprehension Check
What do nerves do?
Why is sleep important for the brain?
Skin and the Five Senses
Your skin is your largest organ and a strong shield against germs and sun. Tiny openings called pores let sweat out to cool you when you are warm. Sense organs help you explore the world: eyes see, ears hear, nose smells, tongue tastes, and skin feels touch, pressure, and temperature. Washing hands, wearing sunscreen, and using gentle soap protect your skin and keep your senses working well.
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