2. Solved Papers
  3. NEET

NEET AIPMT SOLVED PAPER 1999

  • question_answer
                Rate of heart-beat is determined by:                                                                                                         

    A)             Purkinje fibres

    B)             Papillary muscles

    C)             SA node  

    D)             AV node

    Correct Answer: C

    Solution :

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


You need to login to perform this action.
You will be redirected in 3 sec spinner