Cardiac activities of the heart are regulated by: A. Nodal tissue, B. A special neural centre in the medulla oblongata, C. Adrena…

Question

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 (Correct answer)
2. B. A, B, C and D
3. C. A, C and D Only
4. D. A, B and D Only

Correct Answer

Option A — A, B and C Only

Detailed Solution & Explanation

The correct answer is A, B and C Only.

Key Points

• The heart is myogenic: its activity is auto-regulated by specialised muscle (nodal tissue) — A.
• A neural centre in the medulla oblongata moderates cardiac function through the autonomic nervous system — B.
• Adrenal medullary hormones (adrenaline/noradrenaline) can increase cardiac output — C.
• Adrenal cortical hormones (D) do not directly regulate heartbeat, so D is excluded.