Across
- 3. the heart chamber that receives deoxygenated blood from the body and sends it into the right ventricle.
- 4. the thin, smooth inner lining of the heart’s chambers and valves that helps blood flow easily through the heart
- 7. a way of classifying a person’s blood based on the specific antigens found on the surface of their red blood cells
- 8. a thin, protective sac filled with fluid that surrounds the heart and helps keep it in place while reducing friction as the heart beats
Down
- 1. the lower left chamber of the heart that pumps oxygen‑rich blood out through the aorta to the rest of the body
- 2. the lower right chamber of the heart that pumps deoxygenated blood to the lungs through the pulmonary artery
- 5. the upper left chamber of the heart that receives oxygen‑rich blood from the lungs and sends it into the left ventricle
- 6. the thick, muscular middle layer of the heart wall that contracts to pump blood throughout the body