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5. Tissue that is located in the inner ventricular walls of the heart.
6. The biggest artery in the body.
9. Extracellular fluid which bathes the cells of most tissues, arriving via blood capillaries and being removed via the lymphatic vessels.
10. Gel-like collections of blood that form in your veins or arteries when blood changes from liquid to partially solid.
13. Period of contraction of the ventricles of the heart that occurs between the first and second heart sounds of the cardiac cycle.
14. The colorless fluid part of blood and lymph.
16. Bring the oxygen-rich blood and metabolism products to the body.
17. A network of tissues, vessels and organs that work together to move a colorless, watery fluid called lymph back into your circulatory system.
18. The period between aortic valve closure and mitral valve closure.
20. Cardiovascular systems of fish.
21. Has an average rate of 60-100 bpm.

1. The force of your blood pushing against the walls of your arteries.
2. Blood that is unsaturated with oxygen.
3. Cardiovascular systems in mammals and birds.
4. Protein in red blood cells that help transport oxygen.
7. Is a cellular component of the blood that lacks hemoglobin, has a nucleus, is capable of motility, and defends the body against infection and disease.
8. Small blood vessels that help convey blood between the arterioles and venules.
11. Comes in either group A, B, AB or O.
12. The two largest veins that carry blood into the right upper chamber of the heart.
15. A system that consists of the heart, blood vessels, and blood. Its primary function is to transport nutrients and blood to all parts of the body.
19. Carry the carbon dioxide-rich blood and metabolism waste to the heart.