Question

Identify the correct statement regarding cardiac activity

• A. Normal activities of the human heart is regulated intrinsically, hence it is neurogenic
• B. A special neural centre in the medulla oblongata can moderate the cardiac function through the CNS
• C. Parasympathetic neural signals increase the rate of heart beat
• D. Adrenal medullary hormones can increase cardiac output
• E. The end of a T-wave marks the end of diastole

Answer 1

Answer: (D)

Hormones of adrenal medulla include noradrenaline and adrenaline. Nor-adrenaline regulates blood pressure and cardiac output under normal conditions. Adrenaline is secreted during emergency and has a greater effect on cardiac activity than nor-adrenaline.