Class 11 Biology Body Fluids Circulation Regulation of cardiac activity

Regulation of cardiac activity

  • Normal activities of the heart are auto regulated by specialised muscles (nodal tissue), hence the heart is called myogenic.
  • A special neural centre in the medulla oblongata can moderate the cardiac function through autonomic nervous system (ANS).
  • Neural signals through the sympathetic nerves (part of ANS) can increase the rate of heart beat, the strength of ventricular contraction and thereby the cardiac output.
  • Parasympathetic neural signals decrease the rate of heart beat, speed of conduction of action potential and thereby the cardiac output.
  • Adrenal medullary hormones can also increase the cardiac output.


Fig. Regulation of cardiac activity

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