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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:
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:
A
A, B and C Only
B
A, B, C and D
C
A, C and D Only
D
A, B and D Only
Explanation
Heart activities are regulated intrinsically by nodal tissue and extrinsically by medulla oblongata and adrenal medullary hormones.
Detailed Solution
Cardiac activities are auto-regulated intrinsically by nodal musculature (myogenic heart). Extrinsic neural regulation occurs via the cardiac centre in the medulla oblongata (ANS), and hormonal regulation is mediated by catecholamines from the adrenal medulla. Cortical hormones do not regulate heart rate directly.