This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemical Messengers: Receptors, Subject name: Physiology
[{'content': 'Chemical messenger acting at long distance in - \nSelect and explain. \nA. Autocrine, B. Paracrine, C. Endocrine, D. Auto-para-crine', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 6c' i.e., Endocrine o Hormones are chemical mediators that control cellular functions. They are secreted into the blood stream by ductless endocrine glands and thereby exert widespread actions.o Hormone may have : -i) Autocrine action: - Acts on the cell from which it is secreted.ii) Paracrine action: - Acts on neighboring cells, e.g., the effect of gastrin on D cells secreting somatostatin.iii) Endocrine action: - Acts on cells distant to the cell from which it is secreted. Most of the hormones act by this mechanism.", 'role': 'assistant'}]