Heart Crossword

2. A thin sac that surrounds your heart
5. A valve of three flaps that prevents reflux of blood from the right ventricle to the right atrium.
8. A fluid-filled cavity in the heart or brain
9. One of a pair of organs in the chest that supplies the body with oxygen, and removes carbon dioxide from the body.
11. A dividing wall or membrane especially between bodily spaces or masses of soft tissue
12. The muscular layer of the heart
14. The smallest type of blood vessel
15. The fluid that circulates in the heart, arteries, capillaries, and veins of a vertebrate animal carrying nourishment and oxygen to and bringing away waste products from all parts of the body.
18. A blood vessel that carries blood to the heart from tissues and organs in the body.
19. The blood vessels that deliver oxygen-rich blood from the heart to the tissues of the bod
20. The innermost layer of the heart and lines the chambers and extends over projecting structures such as the valves, chordae tendineae, and papillary muscles.

1. A colorless and odorless gas that is a waste product made by the body
3. A heart chamber that receives blood into the heart and drives it into a ventricle, or chamber, for pumping blood away from the heart.
4. Flaps that act as one-way inlets for blood coming into a ventricle and one-way outlets for blood leaving a ventricle
6. To describe how well the lungs work in helping a person breathe
7. An aortic valve that only has two leaflets, instead of three
10. A heart valve with cusps shaped like half-moons; prevents blood from flowing back into the heart
13. A hollow muscular organ of vertebrate animals that by its rhythmic contraction acts as a force pump maintaining the circulation of the blood
16. Air that is breathed in enters the blood from the lungs and travels to the tissues
17. Responsible for transporting oxygen rich blood from your heart to the rest of your body