This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Cell junction in smooth muscle is 
Select and explain. 
A. Zonula adherens, B. Macula adherens, C. Tight junction, D. Gap junction
D: Gap junction
Answer: D: Gap junction 
Explanation: Adjacent muscles fiber of smooth muscle is connected by gap junctions so that action potential from one cell can quickly pass into the neighbouring cells. (Ref: Textbook of medical physiology-Geetha)