Cardiac Regulation: Neural & Hormonal Control — NEET Biology
✅ Asked in NEET 2025Normal activities of the heart are regulated intrinsically, i.e., 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. On the other hand, parasympathetic neural signals (another component of ANS) 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.
NTA tests whether students understand that the heart's beating is intrinsic (myogenic) but can be modulated by the nervous system and hormones. The sympathetic nervous system increases heart rate and cardiac output, while the parasympathetic system decreases them. Students often confuse which branch does what or forget that adrenal hormones (epinephrine) also increase cardiac output. The key trap: thinking the heart needs external signals to beat—it doesn't. It's auto-regulated by nodal tissue, but the ANS and hormones fine-tune its performance. Remember: Sympathetic = speeds up (like 'sym-go faster'), Parasympathetic = slows down.
Cardiac activities of the heart are regulated by:
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