This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
IP3 facilitates which ion entry into cytoplasm? 
Select and explain. 
A. Na+, B. K+, C. Ca++, D. Mg++
C: Ca++
Answer: C: Ca++ 
Explanation: In the cells, Phosphatidyl inositol Pyrophosphate (PIP2) is present in membrane This PIP2 is broken into DAG and IP3 by the enzyme Phospholipase C IP3 being polar will go into cytoplasm and acts as the 2nd messenger Help in releasing calcium stores and increases Calcium levels in the cell.