Vocab33 - 1 myocardium The muscle layer of the heart is the 2 atrium Upper chamber receives blood from the body 3 ventricle Lower chamber pumps blood

Vocab33 - 1 myocardium The muscle layer of the heart is the...

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1. myocardium - The muscle layer of the heart is the. 2. atrium - Upper chamber, receives blood from the body. 3. ventricle - Lower chamber, pumps blood out of the heart. 4. valves - Flaps of connective tissue; are located between the atria and the ventricles and between the ventricles and blood vessels leaving the heart. 5. Pulmonary circulation - pumps blood from the heart to the lungs and back to the heart again. 6. Systemic circulation - pumps blood from the heart to the rest of the body. 7. Pacemaker - A small group of cardiac muscle fibers, the sinoatrial node. 8. Arteries - large vessels that carry blood away from the heart to the tissues of the body. 9. Capillaries - the smallest vessels. Their thin walls allow oxygen and nutrients to pass from blood into tissues and wastes to move from tissues into blood. 10. Veins - return blood to the heart. Many have valves that prevent backflow. 11. Plasma - a straw-colored fluid. It is about 90 percent water and 10 percent dissolved gases,

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