Biology 0.0 / 5 ? Applied ScienceThe heart and blood vesselsASOCR Created by: gitaxxCreated on: 17-04-16 12:09 28310659147 Across 1. This sends an electrical impulse to the atria. (10, 4) 4. Has a thick muscle layer to resist pressure changes (6) 7. Atrial contraction- blood is pumped into the ventricles. (6, 7) 8. There's less muscle and elastic tissue to allow flow of blood under lower pressure (5) 9. The heart's structure has four chambers with one way flaps called? (6) Down 2. Ventricular contraction- blood is forced through the pulmonary artery to the lungs and through the aorta to the rest of the body. (11, 7) 3. The atria relaxation- blood enters the atria from the pulmonary veins or vena cava. (6, 8) 5. These are the upper chambers and they receive blood that is being returned to the heart. (5) 6. Has valves to prevent back flow of blood. (5) 10. This fills with newly oxygenated blood returning from the lungs. (4, 6)
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