The Heart

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Across
  1. 5. The shortening and thickening of functioning muscle or muscle fiber.
  2. 6. Blood with a low O2 saturation
  3. 7. Carries blood from the left side of the heart to the arteries of all limbs and organs except the lungs.
  4. 8. A vessel in which blood flows toward the heart.
  5. 10. The muscular elastic tubes that form a branching system and that carry blood away from the heart to the cells, tissues, and organs of the body.
Down
  1. 1. The vessels going to and from the lungs are the ..... artery and vein.
  2. 2. Either of two heart valves through which blood flows from the atria to the ventricles; prevents return of blood to the atrium
  3. 3. The contraction, or period of contraction, of the heart
  4. 4. The lower chambers of the heart.
  5. 5. The strands of tendon that anchor the cusps of the valves to the muscles of the ventricles of the heart.
  6. 9. Either of the upper chambers of the heart