10-Circ&immun-42+43-S08

10-Circ&immun-42+43-S08 - Circulation and Immune...

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3/3/2008 1 Circulation and Immune function Figure 40.9b An example of negative feedback: Control of body temperature (Layer 1) Figure 40.9b An example of negative feedback: Control of body temperature (Layer 2) Furnace of Life: Positive feedback: • a system of receptors, control center, and effectors • results in a change away from the norm – instability! • Amplifies systems – rare • Exp/ child birth - contractions Change is good! • the only time systems are at perfect equilibrium is when the organism is dead! • the environment is always changing so organisms need means to respond • so each system has the ability to change in response to external and internal stimuli. Circulation: Question: What is the purpose of a circulatory system?
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3/3/2008 2 Circulation: Question: What components would you need for a circulatory system? Circulation: • Simple = used by primitive organisms to transport gases, nutrients and waste thru simple Types of circulatory systems: body Exp/ Cnidarians Figure 42.1 Internal transport in the cnidarian Aurelia Circulation: • Simple = used by primitive organisms to transport gases, nutrients and waste thru simple Types of circulatory systems: body. Exp/ Cnidarians • Open = used by many invertebrates. Moves hemolymph through sinuses in the body. Exp/ Arthropods, Molluscs Figure 42.2 Open circulatory systems Circulation: Simple = used by primitive organisms to transport gases, nutrients and waste thru simple body. Exp/ Cnidarians Open used by many invertebrates Types of circulatory systems: = used by many invertebrates. Moves hemolymph through sinuses in the body. Exp/ Arthropods, Molluscs Closed = used by some inverts, but all vertebrates. Moves materials more effectively. Exp/ Vertebrates
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