Human Body Systems (Harcourt Science Book) A16--A27

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Across
  1. 3. Human beings are made up of _________ of cells A7
  2. 4. The basic unit of structure and function of all living things A6
  3. 8. Nerves are bundles of _______. They carry signals from sensory organs(eyes, ears, nerves) to the brain and from the brain to the muscles.
  4. 12. Scientist who first viewed cells under a microscope and gave them their name A6
  5. 15. Cells that work together to perform a specific function form this? A12
  6. 16. This body system transports oxygen, nutrients, and wastes through the body in the blood
  7. 17. This is the waste product that comes out of your nose and mouth from the Respiratory System? (2 words-no space)
  8. 18. Muscles are attached to bones by this?
  9. 19. This system breaks down food into nutrients and gets those nutrients into the blood.
  10. 20. Tissues that work together form this? A12
  11. 21. There are 206 of these in the human body?
Down
  1. 1. This body system has the nose, mouth, windpipe or trachea, and lungs.
  2. 2. In the Digestive System, this organ produces this, which breaks down fats into smaller particles that can be more easily digested.
  3. 5. Bones are attached to other bones by this?
  4. 6. These blood vessels carry blood away from the heart?
  5. 7. This body system provides support for our bodies. It protects many of our internal organs.
  6. 9. This system connects everything to the brain-brain, spinal cord, nerves, etc...
  7. 10. Organs that work together to perform a function form this? A12
  8. 11. Which part of the circulatory system is being left out? Blood, veins, arteries, and _________?
  9. 13. When you swallow food, it travels down your what?
  10. 14. ________ muscles move bones and hold your skeleton upright which you can control. Involuntary muscles, you cannot control like blinking or your heart muscle pumping, move on their on.
  11. 17. Type of muscle that makes up the walls of your heart.