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Parasympathetic Division
...  colon, the rectum, and the reproductive organs. Protein Receptors Receptors are substances that “receive’ the “message” from the neurotransmitters. These receptors in the effector organs combine with the neurotransmitters. The combination will trigger biochemical or physiological reactions, like muscle contraction and relaxation, increased secretion of hormones in  ...

Visceral Effector Organs
...  you happen to step on a nail, your foot will automatically withdraw without you commanding it. This is a result of the action of the effector organ and similar components. It is called a reflex action because the pain receptors in your foot reacted out of their own volition to initiate the action. You did not “think” about withdrawing your foot. What is the effector organ? The  ...


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