Constitutional isomer (skeletal isomer; structural isomer): One molecule in a set of isomers that differ in the order the atoms are connected. The term ' structural isomer ' is vague (all isomers differ in their structure) and should be avoided. Three Constitutional Isomers of C 5 H 8.
Text Preview. Homeostasis is the maintenance of a constant environment in response to internal and external stimuli. The body requires the constant and healthy environment that only homeostasis can provide Without this environment the body wouldnât be able to carry out the life support process.omeostasis is the maintenance of a constant environment in response to internal and external stimuli.
Almost all homeostatic control mechanisms are negative feedback mechanisms. These mechanisms change the variable back to its original state or âideal valueâ. A good example of a negative feedback mechanism is a home thermostat (heating system). The thermostat contains the receptor (thermometer) and control center. If the heating system is set at 70 degrees Fahrenheit, the heat (effector) is turned on if the temperature drops below 70 degrees Fahrenheit.