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
Most diffusible ion in excitable tissue is 
Select and explain. 
A. Na+, B. K+, C. Ca++, D. Cl-
B: K+
Answer: B: K+ 
Explanation: Most diffusible ion in excitable tissue skeletal muscle and nerve cell is potassium Ref: www.gradestack.com