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BotanyNEET 2025Human heart, cardiac cycle and ECG

Body Fluids and Circulation

Cardiac activities of the heart are regulated by:

A. Nodal tissue

B. A special neural centre in the medulla oblongata

C. Adrenal medullary hormones

D. Adrenal cortical hormones

Choose the correct answer from the options given below:

  1. A.A, B and C only✓
  2. B.A, B, C and D
  3. C.A, C and D only
  4. D.A, B and D only

Solution

The heart is myogenic — its rhythm comes from nodal tissue (A) — but is modulated by a neural centre in the medulla through the autonomic system (B) and by adrenaline and noradrenaline from the adrenal medulla (C). Adrenal cortical hormones do not regulate cardiac activity.

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