Cardiac Muscle Properties — MCQs

What is the role of gap junctions in cardiac muscle function?

If the contractility of the heart is decreased, which of the following is seen ?

Which of the following structures in the heart are known for their rapid conduction of electrical impulses?

How many phases are there in the action potential of cardiac muscles?

Hyperpolarization is caused by which ions?

Which one of the following substances increases the release of Ca2+ from the endoplasmic reticulum?

Which of the following statements about cardiac muscle is incorrect?

The fiber marked as X is:

In the context of muscle physiology, which structure is described as a threadlike component that extends along the length of a muscle fiber?

Sarcomere is the area between which two Z lines?