Anatomy Criss Cross

2. The _________ is located below the lungs.
10. __________ is the muscular layer of the heart.
12. The ______________ is composed of three cusps/flaps.
13. ______________ measure approximately 50 to 100 micrometers in length.
15. _____ are thin-walled chambers that receive blood from the veins.
16. Covering the inner surface of the heart wall is the ___________.
18. The _____________________ are thin structures that are composed of endocardium and connective tissue.
19. ____________ are key molecular regulators of the contraction.
20. The heart is located underneath the _______.

1. Covering the outer surface of the heart is the __________.
3. The _____________ is composed of two cusps/flaps.
4. Rising pressure in the pulmonary trunk artery and aorta forces the _______________ to open.
5. ________ is a displacement of tissue/organ from its normal position.
6. Cardiac muscle cells are called ___________.
7. __________ pumps blood out of the heart.
8. The _______ expands the volume of the chamber.
9. An elastic artery called the _____.
11. Surrounding the heart is a fibrous sac called the ___________.
14. The _______ is the control center of a cell.
17. ________ is relaxation.
18. The narrow end of the heart is called the _____.