Biology Circulation / Transport SZABMU 2022
PMDC Verified Question 29 of 54
Select the duration of cardiac cycle:
A
0.6 sec
B
0.4 sec
C
0.7 sec
D
0.8 sec
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 0.8 sec
Concept:

The cardiac cycle comprises one complete sequence of filling and pumping of the heart.

Formula:

$$ \text{Duration} = \frac{60 \text{ seconds}}{\text{Heart Rate (beats/min)}} $$

Solution:

  • At a normal resting heart rate of roughly \(72\text{ to }75\text{ beats per minute}\):


  • \( \text{Duration} = \frac{60}{75} = 0.8 \text{ seconds} \).


  • This \(0.8\text{ sec}\) cycle includes atrial systole (\(0.1\text{s}\)), ventricular systole (\(0.3\text{s}\)), and complete cardiac diastole (\(0.4\text{s}\)).


Why other options are incorrect:

  • Values like \(0.4\text{ sec}\) describe only specific phases (e.g., joint diastole), not the entire cycle.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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