Cardiac activities of the heart are regulated by: Choose the correct answer from the options given below :
- A, C and D Only
- A, B and D Only
- A, B and C Only
- A, B, C and D
Answer
(3) A, B and C Only
Solution
A. As per NCERT, normal activities of the heart are regulated intrinsically, i.e., auto-regulated by specialised muscles (nodal tissue) — the heart is myogenic — correct.
B. A special neural centre in the medulla oblongata can moderate the cardiac function through the autonomic nervous system (ANS) — correct.
C. Hormones of the adrenal medulla (adrenaline, noradrenaline) can also increase the cardiac output — correct.
D. Adrenal cortical hormones do not regulate cardiac activity — incorrect.
∴ A, B and C only.
Answer: (3)