Which of the following is part of a homeostatic control mechanism? check all that apply.
a) control cener
b) effector stimulus
c) stimulus receptor

a) Control Center

b) Effector

c) Receptor

Explanation:

Homeostasis is maintained by feedback loops. The receptors serve to sense the changes in the variables (the stimulus) and send the information to the control centers.

The control centers, such as the brain, serve as integrator and analyze the changes sensed in the particular condition. Control centers also send signals to the effectors to generate a specific response. The response serves to counteract the changes in the variable and restore it again to the set point.  

For example, thermoreceptors present in the skin layers sense the changes in temperature of surroundings and send the information to the brain. Brain commands effectors to generate a response to maintain constant body temperature. Effectors are muscles and glands mostly.

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.