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see1 When you see, your eyes take in images that go to your brain. You have the power of sight. As people get older, it usually becomes more difficult for them to see. [1/8 definitions]
sense A sense is a way your body and brain get information about the world outside your body. Human beings have five senses. They are touch, smell, taste, sight, and hearing. [1/9 definitions]
sense organ a part of the body that takes in information and sends it to the brain. The eyes and the taste buds are sense organs.
skull the bony framework of the head and face that protects the brain.
sleep If a machine is sleeping, it is not active and it is using very little power. If you say your brain is sleeping, it means you are not really thinking about anything at all. [1/4 definitions]
spinal cord the thick cord of nerve tissue inside the spine that runs from the base of the brain to the end of the spine.
stroke a sudden sickness in the brain caused by the breaking or blocking of a blood vessel. A stroke can cause parts of the body to become numb. It can also cause death. [1/6 definitions]
tissue Tissue is the material that an animal or plant is made of. Tissue is made up of many, many cells.Your body has many types of tissue, such as skin tissue, muscle tissue, and brain tissue. [1/2 definitions]
unconscious If a person is unconscious, they are alive and seem to be sleeping, but they are not really sleeping. They will not "wake up" if there is a loud noise or if you shake them. Their brain is not working in the normal way. If a person gets a hard hit on the head, they may become unconscious. Being unconscious is usually temporary.
unhealthy If something is unhealthy, it is not good for your body. It could make you sick or make you get sick a lot, or it could make you weak or not able to use your brain well. Some unhealthy things could make a person's life shorter. [1/2 definitions]