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Across 1. Thick muscular layer of the heart wall 3. The _______ ventricle has the thickest muscular wall 9. The ____________ valve is located between the left ventricle and the aorta 11. Another name for the pulmonary and aortic valves 12. Contraction of a heart chamber 13. The pump that propels blood around the body

Down 2. The caudal pointed end of the heart that contains the left ventricle 4. The vessels that carry blood to and from the lungs 5. The valve that separates the left atrium from the left ventricle 6. The major artery of the systemic circulation that receives blood from the left ventricle 7. The vein most commonly used for drawing blood when a large amount of blood is needed 8. Relaxation of a heart chamber 10. The pacemaker of the heart