This stretching will trigger the secretion of oxytocin hormones that activate the uterine muscles and it causes a reduction in the space of the uterus.In the case of childbirth, the growth of the baby eventually causes the uterine walls to expand, which is reflected by the stretch receptors.The onset of contractions in childbirth is also known as the Ferguson reflex.Source: Maria Victoria Gonzaga of Biology Online. Figure 1: Positive Feedback Loop showing Wound Clotting. This is one of the life-saving examples of positive feedback. Clotting factors are responsible for the formation of a clot in the injured or wounded area. Thus, overall, the process of sealing the injured site is speeded up. Once the process begins it promotes the clotting process further. At the site of the injury, blood clotting factors are released to initiate blood clotting. Blood pressure and blood flow at the site of injury are reduced. When the body gets injured the major threat to life is excessive loss of blood. One of the major examples of positive feedback is the effort of the body in reversing the damage caused by any injury. In the menstrual cycle, the estrogen hormone promotes the secretion of other hormones that will lead to ovulation.In fruit ripening, there is the release of ethylene, which will continue the ripening process of fruits.At the time of baby birth, there is a dilation of the walls of the uterus that causes a contraction that encourages further stretching (this continues until birth).Clotting factors are released to seal a wound.Each one depicts what a positive feedback mechanism is like: What is an example of positive feedback in homeostasis? Let’s take a look at some of the examples: clot formation, childbirth, fruit ripening, and menstrual cycle. The actual change will continue to amplify by the positive feedback loop until the stimulus is removed. The variation is sensed by the receptor, and then the effector works to produce an identical outcome – this enhances the physiological change. What is a positive feedback loop? Positive feedback involves a physiological system that reinforces the change (works to reinforce or intensify the change). Positive feedback promotes a change in the physiological state instead of reversing it. In this, the effector boosts up the stimulus that enhances the product formation for maintaining body stability. Positive feedback is known as a positive response or a self-reinforcing response to external or internal input. Maintaining homeostasis depends upon two major factors:įor example, a cold-blooded animal, like fish, maintains a lower body temperature according to the external environment whereas a warm-blooded animal like a whale preserves higher body temperature to maintain internal stability. Homeostasis is the maintenance of an internal environment of the body from the harm and fluctuation of the external environment and helps in maintaining body stability. In a negative feedback mechanism, the direction of the response is opposite to the direction of the initial change, resulting in a self-regulating loop.įeedback loops play an important role in order to preserve homeostasis. In other words, in a positive feedback mechanism, the direction of the response is in the same direction as the initial change, resulting in a self-reinforcing loop. Conversely, in negative feedback, the output is decreased or inhibited. In this form of feedback, the output of the system is enhanced. The response effect is magnified so that it can occur much faster. What is positive feedback? Positive feedback is amplifying or magnifying the change or output. It happens when the product of action or any output alters the body’s response. Feedback loops are biological mechanisms in which the living body’s internal stability is maintained depending on its response. They work to maintain body equilibrium under different conditions. The feedback loop contains two major forms: (1) positive feedback and (2) negative feedback. Various biological mechanisms work on the input and output of the body given as the result of a certain stimulus. Keeping the standard or optimum range keeps the body healthy and stable. An optimum value is a normal value about which the standard range varies. Each mechanism of the body like temperature, blood pressure, and levels of specific nutrients has to be in the optimum range so that the body can function properly.
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