Negative & Positive Feedback Homeostatic Control Mechanisms · The three interdependent components of control mechanisms are: - Receptor – monitors the environment and responds to changes (stimuli) - Control center – determines the set point at which the variable is maintained - Effector – provides the means to respond to the stimulus · The variable produces a change in the body Negative feedback Negative feedback takes place to reduce the output or change. This result in the system to return to a stable condition. · Homeostatic regulatory mechanisms are mainly negative feedback responses. · An example of this is thermoregulation control o Control center: hypothalamus (set point approximately 37oC) o Receptors: skin & hypothalamus § If temp rises above 37 oC activity in the hypothalamus targets… o Effectors: smooth muscle in blood vessels supplying the skin dilate & sweat glands increase secretion · As temp returns to normal control center stops signaling the effectors Positive Feedback Positive feedback occurs to enhance or increase the output or change. This results in the reaction to be amplified to speed the process. · Positive feedback is less frequent than negative feedback. · Activated when an urgent response is required o i.e. blood loss & blood clotting and labor during childbirth · In positive feedback systems, the output enhances or exaggerates the original stimulus rather than opposing it. . . . #physiotheraphy #physiostudent #physiogram #physio #studentphysio #students #physiotherapyday #physiotherapist #physiolife #physiologyfirst #physiology #physiologynotes #physiology_notes #feedback #positive #negative #positivefeedback #negativefeedback #mechanism #control #receptor #effector #homeostasis #homeostasis #nerve #physiolab #humanphysiology #pathophysiology #anatomyandphysiology #physiotherapeut #education https://www.instagram.com/p/CBx9tXjJ5ER/?igshid=1fnf39v89mu76
