The thread-like tendons of papillary muscles inserted upon the flaps of tricuspid and bicuspid valves are:

  • A
    Chordae tendinae
  • B
    Yellow elastin fibres
  • C
    Reticulate fibres
  • D
    Collagen fibres

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When is the '$DUB$' sound of the heart heard?

Assertion : Muscle fibres of $SA$ node possess the lowest rhythmicity among all cardiac muscles.
Reason : Due to this fact,it can initiate excitatory waves at the highest rate.

$A$ patch of nodal tissue responsible for initiating the rhythmic contractile activity of the heart is present in:

The right atrium of the human heart receives blood from which of the following?

What are the values of stroke volume and cardiac output under normal conditions?
Stroke Volume $\quad$ Cardiac Output

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