Across
- 2. shape of the heart
- 4. Secretions from the squamous cells help regulate the activity of the myocardium.
- 6. when the heart muscle contracts.
- 10. performance of the human heart from the beginning of one heartbeat to the beginning of the next.
- 11. heart valve that separates the right atrium from the right ventricle
- 14. There are two..located between the atrium and the ventricle on either side of the heart
- 16. Groups of specialized cells in the right atrium that send out the heart's electrical signals
- 17. direct blood flow from the ventricles into the aorta and pulmonary trunk artery.
- 19. connection or opening between two things that are normally diverging or branching.
- 20. pressure of circulating blood against the walls of blood vessels
- 21. consists of an external layer of simple squamous and an inner layer of areolar tissue
Down
- 1. the .... pumps blood out of the heart into the aorta and pulmonary trunk arteries.
- 3. hollow muscular organ that pumps blood throughout the body
- 5. when the heart muscle relaxes
- 7. covers and protects the anterior side of the heart
- 8. consist of the heart blood vessels and blood
- 9. composed of three tissue layers.
- 12. blood that has a low oxygen saturation relative to blood leaving the lungs
- 13. refers to the blood that has been exposed to oxygen in the lungs.
- 15. iron containing protein in red blood cells
- 18. it passes over the heart from the left ventricle and runs down in front of the backbone.