lab investigation
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
LAB INVESTIGATIONExamination 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
LVRV
RA
DOB
OB
The Heart
Pulmonary Vein
AortaPulmonary Artery
Vena Cava
Left Atrium
Left VentricleRight Ventricle
Right Atrium
GUIDE QUESTIONS:1. 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?
2. 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).
4. Notice that the left ventricle is thicker than the right ventricle. Can you give a reason why?
5. Why do you think the aorta is designed to be smooth and large?
PEER ASSESSMENT
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.
Main ideas
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.
The Heart
Pulmonary Vein
AortaPulmonary Artery
Vena Cava
Left Atrium
Left VentricleRight Ventricle
Right Atrium
BLOOD FLOW
DOB from body vena cava RA valves RV pulmonary artery LUNGS pulmonary vein LA valves LV aorta OB to body
• Not a “idealized” drawing
•Labels parallel
•Narrow, clear pencil lines
• No color/ shading
• Arrows show blood flow within the heart