Across
- 3. Muscular organ that pumps blood throughout the body
- 6. Functional units where gas and nutrient exchange occur
- 8. A fast heart rate above 100 beats per minute
- 11. Degree of ventricular myocardial fiber stretch before contraction
- 12. Pacemaker of the heart that initiates electrical impulses
- 13. Vessels that carry blood back toward the heart
- 14. Vessels that carry blood away from the heart
- 15. Inner endothelial lining of the heart chambers
Down
- 1. Heart chamber that pumps oxygenated blood to systemic circulation
- 2. Phase of the cardiac cycle characterized by ventricular contraction
- 4. Specialized fibers that rapidly distribute electrical impulses in ventricles
- 5. Double-walled sac that encloses and protects the heart
- 7. Large artery that directly receives blood from the left ventricle
- 9. Pointed inferior tip of the heart
- 10. A condition of persistently elevated arterial pressure