हिंदी

Regulation of Cardiac Activity

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Estimated time: 2 minutes
CBSE: Class 12

Key Points: Regulation of Cardiac Activity

  • The heart is myogenic - its activities are intrinsically regulated by nodal tissue (SAN and AVN), meaning it generates its own impulse.
  • A neural centre in the medulla oblongata moderates cardiac function through the ANS.
  • Sympathetic nerves (ANS) increase heart rate, ventricular contraction strength and cardiac output.
  • Parasympathetic nerves (ANS) decrease heart rate, slow conduction speed and reduce cardiac output. (AIPMT 2007)
  • Adrenal medullary hormones also increase cardiac output.
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