Blood circulation

Blood circulation - 1. Blood Circulation a. Double loop...

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1. Blood Circulation a. Double loop system b. Fish i. Single loop 2. The heart: valves a. Allow blood to flow in only one direction i. Four valves 1. Atrioventricular valves-between atria and ventricles a. Bicuspid valve (left) b. Tricuspid valve (right) 2. Semilunar valves between ventricle and artery a. Pulmonary semilunar valve b. Aortic semilunar valve b. Valves open as blood is pumped through c. Held in place by chordate tendineae (“heart strings”) d. Close to prevent backflow 3. Operation of the heart valves a. Slide 11.10 4. The heart: associated great vessels a. Aorta i. Leaves left ventricle b. Pulmonary arteries i. Leave right ventricle c. Vena cava i. Enters right atrium d. Pulmonary veins (four)
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i. Enter left atrium i. ***veins oval, arteries round 5. Coronary circulation a. Blood in the heart chambers does not nourish the myocardium b. The heart has its own nourishing circulatory system i. Coronary arteries ii. Cardiac veins iii. Blood empties into the right atrium via the coronary sinus
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Blood circulation - 1. Blood Circulation a. Double loop...

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