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Restate the question in your own words, predict the answer before checking the options, and confirm that the explanation and correct-option field both point to SA node.
AV node is incorrect because it refers to a different organ, substance, process, or medical association. Bundle of His is also incorrect; it may be biologically important, but its principal role or defining feature is not the one being tested here. Purkinje fibres is incorrect because its function, source, target, or disease relationship does not match the question. Therefore option B, SA node, is factually consistent with the stem, the marked correct index, and the explanation. SA node (sinoatrial node) is called the natural pacemaker of the heart.
FAQ
Common questions and clear answers for this topic.
The digestive, circulatory, nervous, and skeletal systems appear most frequently, along with sensory organs and basic endocrine functions.
Yes, the human body has 206 bones, and questions about the largest, smallest, and total bone count appear fairly often.
Questions usually cover blood group compatibility, the role of platelets in clotting, and basic facts about blood pressure and heart function.
No, most questions focus on what each organ does and why, rather than the detailed biochemical processes behind it.
Linking facts to real-life observations, like why pulse is checked at the wrist, makes them easier to recall than memorizing textbook lines.
