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NEET2011ZoologyBody Fluids and CirculationActual

Rate of heart beat is determined by

Options

  1. APurkinje fibres
  2. Bpapillary muscles
  3. CSA-node
  4. DAV-node

Correct answer

C. SA-node

Step-by-step solution

The contraction of heart depends on small cluster of specialised muscle cells which are embedded in the upper wall of the right atrium. This cluster of cells is called the sino-atrial node (SA-node). It automatically and rhythmically sends out impulses that initiate each heart beat.

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