Cardiovascular system

3. the middle muscular layer of the heart
6. A large vein that carries blood to the heart from other areas of the body
7. cartilage that divides the nose into 2 separate chambers
9. a forced expiratory effort against a closed airway
11. a small vein collecting blood from capillaries
13. prevent the backward flow of blood.
16. the membrane enclosing the heart, consisting of an outer fibrous layer and an inner double layer of serous membrane
17. the amount of blood ejected from the ventricle with each cardiac cycle
18. the thin, smooth membrane which lines the inside of the chambers of the heart and forms the surface of the valves
20. the stroke volume of the left ventricle will increase as the left ventricular volume increases due to the myocyte stretch causing a more forceful systolic contraction.
23. the narrowing (constriction) of blood vessels by small muscles in their walls
24. a very small blood vessel that branches off from your artery and carries blood away from your heart to your tissues and organs.
26. a heart condition that causes an irregular and often abnormally fast heart rate
27. A blood vessel that carries blood to the heart from tissues and organs in the body

1. the phase of the heartbeat when the heart muscle contracts and pumps blood from the chambers into the arteries.
2. relating to the lungs.
4. A blood vessel that carries blood from the heart to tissues and organs in the body
5. the phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood.
8. the “gatekeeper” between the atria and the ventricles
10. Heart chamber that receives blood into the heart and drives it into a ventricle, or chamber, for pumping blood away from the heart (left and right)
12. a test to record the electrical signals in the heart
13. a measure of a fluid's resistance to flow
14. muscular chamber that pumps blood out of the heart and into the circulatory system
15. large, with free-running fibers (false tendons) as well as a subendocardial network
19. when blood vessels in your body widen, allowing more blood to flow through them and lowering your blood pressure
21. generates an electrical signal that causes the upper heart chambers (atria) to contract
22. the main blood vessel through which oxygen and nutrients travel from the heart to organs throughout your body.
25. a serous membrane that forms the innermost layer of the pericardium and the outer surface of the heart.