The first heart sound occurs at:

  • A
    Opening of semilunar valve
  • B
    Closing of semilunar valve
  • C
    Onset of auricular systole
  • D
    Sudden closure of $A.V.$ valves

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The '$Bundle$ of $His$' is a group of which of the following?

Which chamber of the human heart has the thickest wall?

The tricuspid valve is found between ...............

Starling's law is related to

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