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  9. Q10

TNPSC Group-I 2017 · Question 10 of 71

Which of the following is correct? The term systole refers to: I. Phase of contraction of lungs. II. Phase of relaxation of lungs. III. Phase of relaxation of heart. IV. Phase of contraction of heart.

Science - Biology

  1. AI and II only
  2. BII and III only
  3. CII only
  4. DIV onlyCorrect

Answer: D. IV only

Explanation

Systole is the phase of contraction of the heart muscle, during which blood is pumped out.

Source: TNPSC Group-I Prelims 2017 (GS1902) - Official Question Paper (scribd OCR, tick-marked answers)

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