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STD 11 - 15. Body fluids and criculations — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 15. Body fluids and criculations1 Mark
MCQ
Given below is the $ECG$ of a normal human. Which one of its components is correctly interpreted below?
  • ✓
    Complex $QRS$ -­ one complete pulse
  • B
    Peak $T$ -­ initiation of total cardiac contraction
  • C
    Peak $P$ and peak $R$ together -­ systolic and diastolic blood pressures
  • D
    Peak $P$­ - initiation of left atrial contraction only
✓

Answer

Correct option: A.
Complex $QRS$ -­ one complete pulse
a
(a) : By counting the number of $QRS$ complexes that occur in a given time period, one can determine the heart beat rate (pulse) of an individual. The $QRS$ complex represents the depolarisation of the ventricles, which initiates the ventricular contraction.

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