Heart

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Across
  1. 2. In someone who is athletic, does stroke volume or heart rate have a greater impact?
  2. 4. In a non-athlete, does stroke volume or heart rate have a greater impact?
  3. 6. The left side of the heart has the ______ AV valve and aortic semilunar valve
  4. 8. The ___ pericardium protects and anchors the heart to surrounding structures
  5. 9. Cardiac output is impacted by _____ _____ and heart rate.
  6. 11. Spiral bundles of contractile cardiac muscle cells
  7. 13. Valves ensure ___ flow of blood through the heart
  8. 17. The more the heart fills with blood during diastole, the greater the force of contraction during systole. This represents the _____-_____ law of the heart.
  9. 18. The degree of stretch on the heart before it contracts
  10. 19. The right side of the heart has the tricuspid AV valve and the ____ semilunar valve
  11. 20. The three layers of the heart are the _______, myocardium, and endocardium
  12. 22. The heart is a hollow organ that is located in the ____ of the thoracic cavity
Down
  1. 1. ____ fibers constitute the great majority of cells in the functional syncytium. They have the necessary myofibrils to contract but do not have the ability to initiate action potentials. These fibers have a very stable resting membrane potential.
  2. 3. The ____ pericardium wraps around the heart and surrounded by pericardial fluid
  3. 5. When Semilunar valves open is arterial pressure or ventricle pressure greater?
  4. 7. When AV valves are open, is atrial pressure or ventricle pressure greater?
  5. 10. Lines chambers and valves of the heart
  6. 12. The heart is surrounded by membranous sac called the ____, which confines the heart to its position in the thoracic cavity while allowing sufficient freedom of movement for vigorous and rapid contraction.
  7. 14. Attachments between cardiac muscle cells, allowing synchronized contraction
  8. 15. The forcefulness of contraction of individual ventricular muscle fibers
  9. 16. ____ fibers, also known as pacemaker cells, spontaneously generate action potentials
  10. 21. The pressure that must be exceeded before ejection of blood from the ventricles can occur
  11. 23. Graph of action potentials produced by heart muscle fibers during each heartbeat.