Lecture 18, Ch. 42

Lecture 18, Ch. 42 - Lecture #18 Date _ Chapter 42 ~...

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Lecture #18 Date _____ Chapter 42 ~ Circulation and Gas Exchange
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Circulation system evolution, I Gastrovascular cavity (cnidarians, flatworms) Open circulatory •hemolymph (blood & interstitial fluid) •sinuses (spaces surrounding organs) Closed circulatory : blood confined to vessels Cardiovascular system •heart (atria/ventricles) •blood vessels (arteries, arterioles, capillary beds, venules, veins) •blood (circulatory fluid)
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Circulation system evolution, II Fish : 2-chambered heart; single circuit of blood flow Amphibians : 3-chambered heart; 2 circuits of blood flow- pulmocutaneous (lungs and skin); systemic (some mixing) Mammals : 4-chambered heart; double circulation ; complete separation between oxygen-rich and oxygen poor blood
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From right ventricle to lungs via pulmonary arteries through semilunar valve (pulmonary circulation) Capillary beds in lungs to left atrium via pulmonary veins Left atrium to left ventricle (through atrioventricular valve) to aorta
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Lecture 18, Ch. 42 - Lecture #18 Date _ Chapter 42 ~...

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