Pulmonary and Systemic Circulation Learning App | Class 9 Biology MCQ e-Book PDF
Class 9 Biology MCQs (Grade 9) From Textbook

Class 9 Biology MCQs – Certification Test 1531

Pulmonary and Systemic Circulation MCQ (Question 1531) – Learning App & e-Book Download

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MCQ 1531: In a minute, the number of times heartbeats is classified as:

  1. relaxing rate
  2. heart rate
  3. cardiac rate
  4. contracting rate

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