01:119:116 Lecture Notes - Lecture 24: Heart Valve, Pulmonary Valve, Pulmonary Artery
15 Mar 2016
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Contracts pump fluid through vessels into sinuses (spaces) Relaxes draws fluid back into heart via pores. Ex: arthropods and some mollusks (not cephalopods: closed. Ex: annelids, cephalopods, and vertebrates: fig 42. 3 (cid:1) Take blood away from the heart and to organs. Divide into smaller vessels arterioles within organs. Arterioles will deliver to capillaries: capillaries. *exchange of materials between blood and tissues. Will merge and form venules: veins. Movement of skeletal muscle puts p on veins. Veins will bring blood back to heart. Walls of vessels: arteries and veins 3 layers. 1 ventricle: blood flow single circuit. Returns to atrium via veins: low efficiency. 1 ventricle: blood flow double circuit. Both atria pump into single ventricle. Ridge in ventricle diverts: most of o2-rich blood systemic, most of o2-poor blood pulmocutaneas, fig 42. 4. Prevent backflow: 2 of 4 valves are atrioventricular valves. Blood returning from tissues and fills atria. P on av valves, forces them to open.
