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:
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:
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:
Show Hint
The heart rate and cardiac output are primarily regulated by the autonomic nervous system and hormones, including both adrenal medullary and cortical hormones.
Updated On: May 27, 2025
- A, B, C and D
- A, C and D Only
- A, B and D Only
- A, B and C Only
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
The regulation of cardiac activities involves multiple factors:
A. Nodal tissue: The nodal tissue, including the Sinoatrial (SA) node and Atrioventricular (AV) node, plays a critical role in generating and regulating the electrical impulses that control the heart's rhythm.
B. A special neural centre in the medulla oblongata: The cardiac control centre in the medulla oblongata regulates heart rate via autonomic nerves, adjusting the heart's response to stimuli.
C. Adrenal medullary hormones: The adrenal medullary hormones, such as adrenaline and noradrenaline, affect heart rate and contraction strength by stimulating the sympathetic nervous system.
D. Adrenal cortical hormones: Corticosteroids (produced by the adrenal cortex) regulate blood pressure and fluid balance, which in turn influences cardiac function, though they do not directly control heart rate.
Thus, the correct answer is A, C, and D only.
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