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67. Rate of heart beat is determined by(a) Purkinje fibres(b) papillary muscles(C) AV-node(d) SA-node.dia |
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Answer» c is the right answer Answer:d)SA nodeExplanation: The rhythm of the heart is normally determined by a pacemaker site called thesinoatrial (SA) nodelocated in the posterior wall of the right atrium near the superior vena cava. The SA node consists of specialized cells that undergospontaneous generation of action potentialsat a rate of 100-110 action potentials ("beats") per minute. d is the right answer (d) is correct answer |
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