HEART DISSECTION

http://www.youtube.com/watch?v=LqhvmUEdOYY&feature=search Cardiovascular rap

http://www.youtube.com/watch?v=H04d3rJCLCE HEART ANATOMY (2 MINS)

Examination of a Mammalian Heart LAB INVESTIGATION Examination of a Mammalian Heart

3 TASKS: Perform dissection

ER Assignments Chief Surgeon handles dissection Asst. Surgeon ensures procedure is strictly followed Circulating Nurse time keeper; keeps records/ notes for the group Scrub Nurse in charge of “patient” and equipment; ensures “operating table” is clean and in order

Heart Dissection Lab 4 16 LAB PERFORMANCE Points Surgeon Asst. Surgeon Circ. Nurse Scrub Nurse 1. Team completes activity 4 2. Practices lab safety 3. Is engaged; performs assigned role 4. Cooperates with team Total (out of 16) 16

3 TASKS: Perform dissection Answer questions/ Fill out chart

3 TASKS: Perform dissection Answer questions/ Fill out chart Draw specimen

CHECKLIST Checklist Title and source of material are listed Drawing is neat and made with clear pencil lines. Labels are neatly written and organized Listed structures are properly labeled: right and left atrium, right and left ventricles, aorta, valves between atrium and ventricle * plus any of the following : vena cava, pulmonary artery, pulmonary vein (some structures may not be clearly visible) Arrows drawn to show flow of blood through the heart Accurate representation (not an “idealized” drawing); no colors/shading

BLOOD PUMP 4 Chambers left/right upper/lower

VENA CAVA AORTA PULMONARY ARTERY CORONARY VESSELS

LA RA LV RV DOB OB

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

The Heart Aorta Pulmonary Artery Valve Pulmonary Vein Valve Vena Cava Left Atrium Right Atrium Valve Valve Right Ventricle Left Ventricle septum

BLOOD FLOW                                                          

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

Double Circulatory System CO2 O2 Lungs Pulmonary Artery Pulmonary Vein CO2 O2 Vena Cava (main vein) Aorta (main artery) Heart CO2 O2 Arteries carry blood Away from the heart Veins carry blood towards the heart Rest of body

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. Notice that the left ventricle is thicker than the right ventricle. Can you give a reason why? 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). Why do you think the aorta is designed to be smooth and large?

Coronary vessels provide blood supply to the heart muscle. PEER ASSESSMENT Coronary vessels provide blood supply to the heart muscle. Valves are designed to be tough to resist high blood pressure within heart. Damage to valve leads to backflow and mixing of blood which is not efficient. Left ventricle is thicker since it requires more force (blood pressure) to pump blood out to entire body; right ventricle only pumps blood short distance to the lungs. Ventricles are thicker. Atria collects blood (only “pump” to ventricles right below) while ventricles pump blood out of heart, requiring a tougher muscular wall to create more force . Aorta is main pathway of oxygenated blood to body so it needs continuous and steady flow.