This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conducting System of Hea, Subject name: Physiology
False about funny current channel in hea 
Select and explain. 
A. It is a Na-K ATPase pump, B. They are responsible for diastolic depolarization, C. It is responsible for spontaneous rhythm producing tissue of hea, D. They are voltage dependent channel only
A: It is a Na-K ATPase pump
Answer: A: It is a Na-K ATPase pump 
Explanation: Funny / leaky Na+ channels: - Hyperpolarization activated cyclin nucleotide gated (HCN) channels. More the hyperpolarization more the activation Equally permeable for Na+ & K+ After repolarization occur by K+ exit in pacemaker cells, next depolarization spontaneously reaches threshold, major pa in this spontaneous depolarization is by Na+ funny channel.