BIO 211 Lecture Notes - Lecture 4: Negative Feedback, Positive Feedback, Endocrine System
4 Aug 2020
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Document Summary
Control systems are grouped into two classes. Local controls that are inherent in an organ. Feedback: responses made after change has been detected. Control center: compares sensor"s input with a controlled variable. Variables aim to be ideal point set point. Effector: makes a response to produce a desired effect. Produces a response (system output) which is feedback to receptor. Do not occur as often as negative. The response reinforces the stimulus, sending the variable farther from the setpoint. Oxytocin in child birth is efferent pathway. Inducing birth is injecting a hormone that mimics oxytocin. Cut induces platelets to release chemicals which attract more platelets. Clotting until break is sealed then feedback cycle ends. Term used for responses made in anticipation of a change. A sensor element, also referred to as a sensory receptor or detector, measures and monitors the actual value of some aspects of the internal environment.
