Heart

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Across
  1. 3. The upper Chambers of the heart
  2. 5. The heart Muscle tissue, specifically the thick middle layer of the heart that is responsible for its contractile and pumping action.
  3. 6. is the circuit that carries oxygenated blood from the heart to all the body's tissues and organs
  4. 7. double layered sac of connective tissue that surrounds the heart, enclosing it and the roots of the great blood vessels.
  5. 8. A hollow chamber within an organ or body structure
Down
  1. 1. is the short loop that carries blood between the heart and lungs
  2. 2. The phase of the cardiac cycle when the heart muscle relaxes and fills the body.
  3. 4. The contraction phase of the heart muscle, where the heart pumps blood out of the body.