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Chapter_40_to_post - Chapter 40 Basic Principles of Animal...

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Chapter 40 Basic Principles of Animal Form and Function
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Homeostasis tendency of living things to try to maintain their structure and regulate their internal environment
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Fig. 40-6 Stimulus Hormone Endocrine cell Signal travels everywhere via the bloodstream. Blood vessel Response (a) Signaling by hormones Stimulus Neuron Axon Signal Signal travels along axon to a specific location. Signal Axons Response (b) Signaling by neurons
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Homeostasis 1- negative feedback: a change in one direction causes a series of events in the other direction to counteract the change BIOLOGICAL: body temp of 37°C (97.6F) PHYSICAL: house thermostat
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NEGATIVE FEEDBACK all about SENSORS and EFFECTORS
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Fig. 40-16 Sweat glands secrete sweat, which evaporates, cooling the body. Thermostat in hypothalamus activates cooling mechanisms. Blood vessels in skin dilate: capillaries fill; heat radiates from skin. Increased body temperature Decreased body temperature Thermostat in hypothalamus activates warming mechanisms. Blood vessels in skin constrict, reducing heat loss. Skeletal muscles contract; shivering generates heat. Body temperature increases; thermostat shuts off warming mechanisms. Homeostasis: Internal temperature of 36– 38°C Body temperature decreases; thermostat shuts off cooling mechanisms.
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initial change in one direction sets off a series of events that intensifies a change in that same direction. Biological:
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This note was uploaded on 05/13/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter_40_to_post - Chapter 40 Basic Principles of Animal...

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