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