Body systems

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Across
  1. 3. Acts through chemical messengers called hormones that influence growth, development, and metabolic activities.
  2. 6. The function of this system is defense against invading microorganisms and disease.
  3. 8. This system is responsible for the exchange of oxygen and carbon dioxide between the atmosphere and the body cells.
  4. 9. Composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement.
  5. 10. Consists of bones, cartilage, ligaments and tendons and accounts for about 20 percent of the body weight.
Down
  1. 1. Your body's outer layer. It consists of your skin, hair, nails and glands.
  2. 2. Processes food into molecules that can be absorbed and utilized by the cells of the body.
  3. 3. Function is to rid the body of waste products that accumulate in the blood.
  4. 4. The major controlling, regulatory, and communicating system in the body.
  5. 5. Ensures survival of the species.
  6. 7. Consists of the heart, which is a muscular pumping device, and a closed system of vessels called arteries, veins, and capillaries.