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Biology
Body Fluids and Circulation
83 questions from 38 papers, each with its answer.
- 83 questions
- 38 papers
- 2.35% of Biology
Cardiac Conduction System
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Following are the stages of pathway for conduction of an action potential through the heart: A. AV bundle B. Purkinje fibres C. AV node D. Bundle branches E. SA node Choose the correct sequence of pathway from the options given below:The SA node generates the action potential, which stimulates both atria to contract. It is conducted to the AV node, then through the AV bundle (bundle of His), which divides into the right and left bundle branches, and finally through the Purkinje fibres into the ventricular musculature. Pathway: SA node → AV node → AV bundle → Bundle branches → Purkinje fibres, i.e. E-C-A-D-B.
Electrocardiogram (ECG) Waves
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Match List-I with List-II regarding ECG waves and the cardiac event they represent.
Pick the matching item from Column II for each row.
Column I
- A. P wave
- B. QRS complex
- C. T wave
- D. T-P gap
Column II
- I. Heart muscles are electrically silent.
- II. Depolarisation of ventricles.
- III. Depolarisation of atria.
- IV. Repolarisation of ventricles.
Correct answer: A → III, B → II, C → IV, D → I
P wave – depolarisation of atria QRS complex – depolarisation of ventricles T wave – repolarisation of ventricles T-P gap – heart muscles are electrically silent Correct match: A-III, B-II, C-IV, D-I.
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