Heart Structure Function of a heart What is

Heart Structure

Function of a heart • What is the function of blood? • What is the function of the heart? • Does an organism need blood to survive?

Blood / Fluid • The movement of fluid in organisms allowed what major ability in animals that is not present in all other organisms? • How does having a heart help the fluid transport?

Energy Burn • Movement is the most taxing metabolic process in the body. It requires more energy, therefore the organism requires more food. – Birds Heart beats up to 500 times per minute requires organism to eat more than 3 x its body weight per day

How does blood flow? • Which vessels are under pressure? That is to say which blood vessel would spurt blood if cut? Arteries? Veins? Capillaries? • Why? • What vessels are under no pressure? Why? • Rate the speed of blood movement (fastest to slowest) • Capillary • Artery • Vein

Veins • So after all pressure is lost in the capillary system, blood must return to the heart through veins. • How are veins powered? (extra credit 3 pts)

Heart advancement • Fish 2 Chamber heart – 1 Atrium – 1 Ventricle • Amphibians / Reptiles 3 Chamber heart – 2 Atria – 1 Ventricle • Birds/Mammals 4 Chamber Heart – 2 Atria – 2 Ventricles

Advancement • How is a 3 chamber heart better than a 2 chamber heart? Explain • (Remember the function of the heart) • How is 4 chambers better than 3 chambers? Explain.

Blood Flow • Blood arrives from Vena Cava • Passes into Right Atrium to Right Ventricle (tricuspid valve) • Rt Ventricle to Pulmonary Artery to Lungs • Lungs to Pulmonary Vein to Left Atrium • Left Atrium to Left Ventricle (bicuspid valve) • Left Ventricle to Aorta (semilunar valve)

Identify the parts of the heart Aorta Coronary Artery / Vein Left Atrium Left Ventricle Pulmonary Artery Pulmonary Vein Right Atrium Right Ventricle Superior Vena Cava