Question

Why are so few processes positive feedback mechanisms?

a. Positive feedback mechanisms can be dangerous or fatal since they draw the body into unnatural situations
b. Positive feedback mechanisms can be dangerous or fatal since it weakens the body and decreases metabolism rate
c. Positive feedback mechanisms increase the original stimulus to push the variable farther, which can be unstable and if left unchecked can be dangerous or fatal
d. Positive feedback mechanisms decrease the original stimulus to push the variable farther, which can be unstable and if left unchecked can be dangerous or fatal
e. The statement is false; there are more positive feedback mechanisms in our body than negative feedback mechanisms

Answer 1

Positive feedback mechanisms are less common than negative feedback mechanisms because they tend to lead the body away from homeostasis by amplifying the original stimulus, which can be detrimental. Negative feedback loops prevail as they maintain stability in the body's internal environment by adjusting and counteracting deviations from a set point.

Step-by-step explanation:

The reason why positive feedback mechanisms are less common compared to negative feedback loops in the human body is that positive feedback tends to amplify the original stimulus, potentially leading the body away from a state of homeostasis, which can be harmful or even fatal. For instance, during childbirth, uterine contractions are intensified through a positive feedback mechanism involving the hormone oxytocin. However, positive feedback leads to instability; if left unchecked, it can cause damage, such as exacerbating heart tissue damage during a heart attack.

Negative feedback mechanisms, on the other hand, work to maintain homeostasis by counteracting changes in the internal environment. When glucose levels rise after eating, for example, insulin is released to lower these levels, exemplifying negative feedback. Should glucose levels fall, the hormone glucagon works to increase them. This balancing act is essential for survival, keeping the internal environment within manageable limits.