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 3x 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 3pts)

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