BIOLOGY 151 1st Edition Lecture 33Outline of Last Lecture 1. GI tract2. Regions of GI tract3. Small intestine4. Fluid handling by GI tract5. CTFROutline of Current Lecture 1. Circulatory system2. CirculationCurrent Lecture - 4/13Circulatory system:- pulmonary artery carries deoxygenated blood - beating heart increases pressure of circulatory system, pumps blood through veins- elastic fibers allow expansion- blood cells are rigid and tumble around- blood pressure depends on diamond of blood vesselsCirculation:- circulation to deliver nutrients, salt, and hormones to tissues and take away waste products and CO2- larger animal means diffusion becomes inefficient- no cells further than 2-3 cell diameters from capillary - heart pumps blood into arterial system, branches into capillaries, transfer of materials- capillaries fuse into venous system, which brings blood back to heart- capillary walls thin and fluid forced out, sometimes through fenestrations (holes) in wall- fluid is lymph and collected via lymphatic system and returned to heart- right heart pump circulates blood to lungs for oxygenation - left pump sends blood through rest of body- blood leaves heart through aorta- arterioles, then capillaries, then joins together into venules, veins, and back to single large vein (vena cava) that delivers blood back to heart- pressure highest near heart- arteries and arterioles stronger/more elastic than veins, which are more pliableThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- circular smooth muscles control capillary flow- all blood goes from right heart to lungs to left heart to body and back to right
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