As part of a delicately balanced system, the human heart secretes a hormone, a substance that controls the amount of salt in the blood and the volume of blood circulating within the body. Only very small quantities of the hormone are required. This hormone is extremely important in regulating blood pressure and is found in large amounts in the blood of those suffering a heart attack.
Conclusion:
[color=#ffff00]Heart functions- Hormone secretion. that Hormone controls the amount of salt in the blood and the volume of blood circulating within the body.
[/color]
(A) if there is a deficiency in the amount of heart hormone secreted, low blood pressure will result
// Only blood pressure regulation is mentioned, not low bp
(B) it is large quantities of the heart hormone that cause heart attacks to occur
// No evidence for the hormone being the reason of heart attack
(C) the effects of a small amount of the heart hormone will be long-lasting in the body
// no evidence about long lasting effects
(D) if a device that is only a mechanical pump is used as an artificial heart, it will not perform all the functions of the human heart
// this is in line with the para that mentions hormone secretion as a heart function, which a mechanical pump wont do. so Correct!
(E) any drug that regulates blood pressure will have its effect by influencing the amount of the heart hormone secreted
// there is no relation between how heart secretes the hormone


+Kudos if liked the explanation