Class NEET 2026 ALL Q #2024
KNOWLEDGE BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
The number of action potentials generated by sino-atrial node (SAN) in a healthy human is per minute.
(A) 120-140
(B) 28-30
(C) 70-75
(D) 100-110
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Correct Answer: C

AI Tutor Explanation

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Detailed Solution

Step 1: Identify the role of the Sino-Atrial Node (SAN)

The Sino-Atrial Node, often referred to as the pacemaker of the heart, is a specialized bundle of neurons located in the right atrium. It is responsible for initiating the electrical impulses that lead to cardiac contraction.

Step 2: Recall physiological data for a healthy human

In a healthy adult human, the heart rate is typically defined by the frequency of impulses generated by the SAN. This rate is standardly recognized in human physiology as approximately 70 to 75 beats per minute.

Step 3: Evaluate the given options

Comparing the standard physiological range (70-75) with the provided options, option (C) aligns perfectly with the textbook definition of the normal resting heart rate.

Final Answer: 70-75

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must retrieve specific physiological knowledge and apply it to identify the correct range for a healthy human heart.
Knowledge Dimension: FACTUAL
Justification: The question tests the recall of specific biological data points (heart rate) directly from the NCERT curriculum.
Syllabus Audit: In the context of NEET, this is classified as KNOWLEDGE (Textbook). This question is a direct retrieval task from the 'Body Fluids and Circulation' chapter, essential for foundational medical entrance preparation.

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