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| A group of cells that work together to do a certain job form a _____. |
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| _________ is made of muscle cells, which are flat and layered. Muscle cells tighten and relax to move parts of a body. |
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| ______ is made of different kinds of blood cells floating in a liquid. |
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| Tissues that work together to do a job form ________. The heart, stomach, brain, and lungs are all ________. |
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| When organs work together to do a job, they form _____________. |
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| Your _________ supports your body and gives it shape. It also protects other body parts, such as your heart and lungs. |
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| Your skeletal system works with your ________ to allow movement. |
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| ________ pull on bones, letting you move yours arms, legs, and other body parts. |
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| _________ work all by themselves to make your heart pump blood. You cannot control your ______ muscles. |
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| These are found in organs like your stomach, lungs, and blood vessels. __________ move things like food and blood through organ systems. |
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| Your _______ is made of grgans that work together to help you break down food into molecules that your cells can use to produce energy. |
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| Your digestive system starts working when you put food in your ____. |
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| The _____ in your mouth helps break the food down. |
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| When you swallow, food travels through the _______ to the stomach. |
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| Liquid food passes into the ________, where different juices are added to break the food down even more. |
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| The parts of the food that can't be broken down travel to the __________. The _________ takes the water out of the food. |
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| Leftover material is stored in the ______ before leaving the body as waste. |
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| The _________ controls all of the body's systems. |
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| The ___________ includes the spinal cord and brain. |
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| The __________ runs from your brain down your spine. All the nerves in your body connect to the brain through the ____________. |
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| The _______ is the body's control center. It receives and processes information from the rest of the body. It then sends commands that tell the body how to respond. |
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| The _________ include the eyes, ears, nose, tongue, and skin. |
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| The ___________ takes in oxygen for your cells to use. It also gets rid of waste. When you breathe in, you bring oxygen into your body. When you breathe out, you get rid of carbon dioxide and water vapor. |
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| Air comes into the body through the ____ and ____. |
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| Air travels down a tube called the __________. |
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| Blood is part of the ____________. the job of the ___________ is to move blood throughout the body. |
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| ________ brings oxygen and nutrients to the body's cells. It also carries away their waste. |
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| The ________ is the "motor" that powers the circulatory system. |
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| _________ are blood vessels that carry blood away from the heart. |
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| ________ return blood from the body to the heart. |
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| The very small blood vessels that connect arteries to veins are called __________. |
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| __________ are plant organs that grow deep into the soil. |
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| _________ are plant organs that contain bundles of hollow tubes. |
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