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Feedback Mechanisms

From the Review Book

Homeostasis A stable internal environment. “Balance”
Deviations Changes in the environment.
Stimulus (Stimuli) A change in the environment that causes a response.
Response A reaction to the stimulus.
Dynamic Equilibrium The condition that results from the constant small corrections that keep a balance.
Feedback Mechanism A cycle in which the output of the system feeds back to either modify or reinforce the action of the system.
Positive Feedback A change that leads to a greater change and a greater response. Ex: Childbirth, Blood Clotting
Negative Feedback A change in the environment that causes another change that will attempt to restore homeostasis.
Sensors Structure(s) that detect changes in the internal or external environment.
Endocrine Gland A structure in the human body that makes hormones and secretes them directly into the blood.
Hormone A chemical message sent in the bloodstream from endocrine glands.
Target Cell A cell with the matching receptor to the hormone.
Regulation (Regulate) All the activities that help to maintain homeostasis.
Inhibit To Stop or slow down.
Stimulate To Trigger, provoke.
Secrete To make and release (glands secrete hormones into the blood)
Pancreas A gland that secretes insulin.
Insulin A hormone that lowers blood sugar levels.
Guard Cells Specialized cells that surround pores on the surface of the leaf and change size to reduce evaporation. Regulate CO2 and water vapor on hot days.
Pituitary Gland Located in the brain. “Master Gland” Controls all other glands in the body. Secretes HGH.
Testes Male gonads. It makes sperm and the hormone testosterone. Testosterone controls male reproductive system and secondary sex characteristics.
Ovaries Female gonads. They make eggs and the hormones estrogen and progesterone which regulate the female reproductive system and secondary sex characteristics.
Created by: dlong