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LAB INVESTIGATION

LAB INVESTIGATION. Examination of a Mammalian Heart. BLOOD PUMP. 4 Chambers left/right upper/lower. VENA CAVA. AORTA. PULMONARY ARTERY. CORONARY VESSELS. VALVES. Flap-like structures that prevent backflow of blood. LA. RA. LV. RV. DOB. OB. The Heart. Aorta.

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LAB INVESTIGATION

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  1. LAB INVESTIGATION Examination of a Mammalian Heart

  2. BLOOD PUMP • 4 Chambers • left/right • upper/lower

  3. VENA CAVA AORTA PULMONARY ARTERY CORONARY VESSELS

  4. VALVES Flap-like structures that prevent backflow of blood

  5. LA RA LV RV DOB OB

  6. The Heart Aorta Pulmonary Artery Pulmonary Vein Vena Cava Left Atrium Right Atrium Right Ventricle Left Ventricle

  7. GUIDE QUESTIONS: • You will also find tiny blood vessels along the surface of the heart. These are the coronary arteries and veins. Why do you think these blood vessels are very important? • The purpose of the valves is to prevent the blood from flowing backward. Using a dissecting needle (or the tip of a forceps), puncture a valve and try to lift the heart. 2- What do you observe? Explain. • 3. Observe carefully and compare the thickness of the ventricle walls to the atria walls. Which are thicker? Explain (relate this to the two structures’ behavior). • Notice that the left ventricle is thicker than the right ventricle. Can you give a reason why? • Why do you think the aorta is designed to be smooth and large?

  8. PEER ASSESSMENT Main ideas Coronary vessels provide blood supply within the heart. Valves are designed to be tough to resist high blood pressure within heart. Damage to valve leads to backflow. Left ventricle is tougher since it requires more force (blood pressure) to pump blood out to different body cells; right ventricle pumps blood only to the lungs. Atria collects blood while ventricles pump blood requiring a tougher and muscular wall to create more force . Aorta is main pathway of oxygenated blood so it needs continuous and steady flow.

  9. The Heart Aorta Pulmonary Artery Pulmonary Vein Vena Cava Left Atrium Right Atrium Right Ventricle Left Ventricle

  10. BLOOD FLOW

  11. DOB from body  vena cava  RA  valves  RV  pulmonary artery  LUNGS  pulmonary vein  LA  valves  LV  aorta  OB to body

  12. Not a “idealized” • drawing • Labels parallel • Narrow, clear • pencil lines • No color/ • shading • Arrows show blood flow within the heart

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