Animal phys Lec 10-09-07

Animal phys Lec 10-09-07 - Animal phys Lec Papers due on...

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Animal phys Lec 10-09-07 Papers due on Thursday This week talking about circulatory systems Basically, it’s 3 topics, but I’m not sure if we’ll get to the 3 rd . 1. Compare/contrast different systems 2. Vertebrate heart and how it controls 3. Blood pressure in vertebrates/invertebrates and its control *We’ll contrast animals which have 2 types of circulatory systems open. *You see here on your crayfish or grasshopper legs…animals with an open circulatory system have very few vessels. They do have them but they are few and the majority of the blood is not contained in them. *The definition of an open circulatory system is that the blood bathes the system’s cell directly. *There is no, capillary system…the blood touches the cells directly *Function of the few vessels present is for direction, so the blood moves where you want it too, like a channel *In a closed system (annelids, vertebrates, cephalopods), there are many many vessels/capillaries and all the blood is found in the vessels. The blood does not touch the cells directly. And of course there are the good, the bad, and the ugly when you compare and contrast (good test question) open and closed circulatory system. *The blood in both systems may contain cells, in vertebrate they’ve become adaptive to immune functions and oxygen storage. *In arthropods, especially, they have clotting functions. *Open systems will have cells in their blood – but some do not. Blood of open and closed systems may have oxygen pigment storage functions. *In a closed system there is hemoglobin. In an open one there is hemocyanin (crustacean: crabs, shrimp, etc) – binds to iron so their blood is usually blue-ish instead of redish. *Insects do not have blood pigments (no oxygen storage compound in their blood). *Look on page 24 of the handouts (upper diagram: first 2 lines) *Both systems must have some sort of pump, which we usually call the heart. *Whether you talk about open or closed, the function is the same. Push blood in a certain direction. *Here’s where the difference is: *In open there is blood volume and blood pressure (10-50% -- much higher, some cases where 50% of the animal’s weight is from their blood) The blood pressure is low *In a closed system the blood volume is very low (5-10% of their weight is blood) October 09, 2007
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Blood pressure is high
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