This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Action potential is generated in excitable cells. These cells are: 
Select and explain. 
A. Nerves, B. Muscle, C. Glands, D. All
D: All
Answer: D: All 
Explanation: All of them. Ie., A Nerves; B i.e. Muscle; C i.e. Glands Action potential develops in excitable cells such as nerves (neurons), muscle (skeletal, smooth and cardiac), and other contractile tissues such as few glandsQ. Glial cells such as neuroglial cells do not generate action potential.