Human body parts

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Across
  1. 2. Need to prevent blood from flowing backwards, and so they have special valves that prevent this from happening.
  2. 5. Tubular muscle that forces food down to your stomach in a process called peristalsis
  3. 6. Makes a mixture of chemicals called bile, which is used to digest fat and neutralise (deactivate) stomach acid.
Down
  1. 1. They usually carry oxygenated blood to all the cells of the body
  2. 3. Each of the pair of organs situated within the ribcage, consisting of elastic sacs with branching passages into which air is drawn, so that oxygen can pass into the blood and carbon dioxide be removed.
  3. 4. A band or bundle of fibrous tissue in a human or animal body that has the ability to contract, producing movement in or maintaining the position of parts of the body.