Re: Discussion Assignment Unit 7Positive and negative feedback systems are used by the body to maintainhomeostasis and keep internal body fluctuations close to the set point.The hormones produced by the glands of the endocrine system play an importantrole in homeostasis. An effector gland is a structure of the endocrine system thatreleases hormones in the body. Effector glands are one of the three structuralelements required to regulate homeostasis. When the endocrine system uses theeffector glands to release hormones or chemical messengers in the body, thesehormones help regulate cellular activity. However, this hormonal release iscontrolled by a stimulus. The stimulus is influenced by internal and externalchanges occurring in the body. The body controls this connection between astimulus and hormonal response through the action of feedback regulation. Thereare two types of homeostatic feedback regulatory mechanisms—negative feedbackand positive feedback."Positive FeedbackIn a positive feedback mechanism, the output of the system stimulates the systemin such a way as to further increase the output. Common terms that could describepositive feedback loops or cycles include “snowballing” and “chain reaction”.Without a counter-balancing or “shut-down” reaction or process, a positivefeedback mechanism has the potential to produce a runaway process. As noted,there are some physiologic processes that are commonly considered to be positivefeedback, although they may not all have identifiable components of a feedbackloop. In these cases, the positive feedback loop always ends with counter-signalingthat suppresses the original stimulus.generic feedback loop that shows the input entering the system arrow to a receptorarrow to the system checking against references and arrow moving to an effectorand then back to input.A good example of positive feedback involves the amplification of laborcontractions. The contractions are initiated as the baby moves into position,stretching the cervix beyond its normal position. The feedback increases the
strength and frequency of the contractions until the baby is born. After birth, thestretching stops and the loop is interrupted.