The receptor monitors the set point for a variable in the environment. If there is a a stimulus, the receptor signals the control center to produce an effector that will alter the environment and bring it <span>to the set point.
Hence,the right answer is :
</span><span>c. it is the respone to a stimulus</span>
<span>Epinephrine is most likely to be released into the bloodstream in order to accelerate one's heartbeat. This usually occurs when one is in danger, thus, preparing the individual for a fight-or-flight response. This hormone is also most commonly known as adrenaline as it is secreted by the adrenal glands. </span>
the brain and heart are composed of 73% water, and the lungs are about 83% water.
Ask for help from a colleague who knows how to use the equipment
