Q241: The diaphragm is a muscle located below the lungs that helps us breathe.
Answer: True ✔
💡 When the diaphragm contracts and moves down, the lungs expand and air comes in (inhaling), and when it relaxes, air goes out (exhaling).
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Answer: True ✔
💡 When the diaphragm contracts and moves down, the lungs expand and air comes in (inhaling), and when it relaxes, air goes out (exhaling).
Answer: The esophagus
💡 After we swallow, food goes down the esophagus, and the muscles in its wall push it into the stomach, while the windpipe (trachea) is the air's path to the lungs.
Answer: False ✖
💡 A muscle works by contracting, so it can only pull a bone; that is why muscles work in pairs: one bends the arm and the other straightens it.
Answer: The heart muscle
💡 The heart muscle contracts day and night throughout our lives without us thinking about it, while we move the muscles of the arm, leg and fingers whenever we want.
Answer: Arteries
💡 Arteries are vessels with thick, elastic walls that carry blood forcefully away from the heart to the body's organs, and we can feel their pulse in the wrist and neck.
Answer: Melanin
💡 Melanin is a pigment made by the skin; more of it means a darker color, and it helps protect the skin from the sun's rays.
Answer: True ✔
💡 When the body heats up in hot weather or during exercise, the skin produces sweat, and as the sweat evaporates, the body cools down.
Answer: The nervous system
💡 The nervous system controls the whole body: the brain thinks and gives orders, and the spinal cord and nerves carry messages between it and the rest of the body.
Answer: Taste buds
💡 The surface of the tongue has thousands of taste buds that detect sweet, salty, sour and bitter, and send that information to the brain.
Answer: True ✔
💡 The hairs and mucus inside the nose trap dust and some germs, and the nose also warms and moistens the air before it reaches the lungs, which is why breathing through the nose is better.
Answer: True ✔
💡 This is the normal resting heart rate for an adult. Children's heart rates are a little faster, and the heart rate goes up with running and playing.
Answer: The iris
💡 The iris is the colored part of the eye. It may be light brown, dark brown that looks black, hazel, green or blue, and it controls how wide the pupil opens.
Answer: True ✔
💡 One healthy kidney can do the work of two, which is why some people live normal lives with only one kidney.
Answer: True ✔
💡 The pupil is an opening in the middle of the eye. The iris makes it smaller in bright light to protect the eye and bigger in the dark to let in more light so we can see.
Answer: False ✖
💡 The kidneys are in the back of the abdomen on both sides of the spine, below the diaphragm, and each one is shaped like a bean.
Answer: False ✖
💡 The small intestine got its name because it is narrower, but it is much longer: in an adult it is several meters long (about 6 meters), while the large intestine is about one and a half meters long.
Answer: Brushing your teeth with toothpaste twice a day
💡 Brushing your teeth with a toothbrush and toothpaste in the morning and before bed removes the food bits and germs that cause cavities.
Answer: The eardrum
💡 Sounds are waves that enter the ear and make the eardrum vibrate. The vibrations travel through tiny bones to the inner ear and then to the brain.
Answer: Moving the body
💡 Muscles contract to pull on the bones and move them, so we use them to walk, write and smile, and some, like the heart muscle, work without us controlling them.
Answer: The mouth, then The esophagus, then The stomach, then The small intestine, then The large intestine
💡 Food is chewed in the mouth and goes down the esophagus to the stomach, then its digestion is completed and it is absorbed in the small intestine, and water is absorbed from the leftovers in the large intestine.