119heart-lab-tas09 - 1 TA COPY ONLY HEART LAB ANSWERS TO...

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TA COPY ONLY HEART LAB ANSWERS TO THE REVIEW QUESTIONS Heart Structure 1. Why is the heart built as a double pump (i.e. why right & left sides)? Pressure is not sufficiently high to move blood through entire systemic circuit, after blood leaves the lungs. High metabolism, large appendages & gravity require a high-pressure loop. 2. Why do our hearts have atria, if the ventricles supply the force to move blood into arteries? Need a "collection" chamber for blood. Ventricle contraction pushes blood forward in a closed loop & blood has to push into an "open" space. 3. Label the major blood vessels on the heart diagram for the class & give the destinations for that blood. Which vessels carry oxygenated blood? Which deoxygenated? Explain why arteries are thicker walled than veins. Vena cava, pulmonary artery - deoxygenated Pulmonary vein, aorta - oxygenated Arteries are under higher pressure than veins & arteries must expand/stretch & then recoil while pressure in veins is low. 4. Label the major heart chambers on the heart diagram for the class. Draw 2 lines to show the pathway of blood through the chambers & vessels. see diagram 5. Explain when & why the AV valves close, include a description of the pressure differences on either side of these valves when closed. What sound does the closure of the AV valves make? AV valves open when the ventricles relax & the pressure is higher in the atria than the ventricles. AV valves close when the ventricles contract & the pressure is higher in the ventricles than the atria. “lub” - 1 st sound when the AV valves close (turbulent blood flow hitting the valve makes the sound). 6. Explain when & why the semilunar valves close, include a description of the pressure differences on either side of these valves when closed. What sound does the closure of the semilunar valves make? Semilunar valves open when the ventricles contract & the pressure in the ventricles is greater than the pressure in the arteries.
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