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Definitions of key words

Homeostasis The maintenance of a constant internal environment
Stimulus A 'change' in the internal or external environment
Sensor The part of the body that detects a change in conditions either external or internal
Communication System The part of the body that receives signals from sensors and reacts in a way that will change the conditions
Effector The actions that are carried out that will effect a change in conditions
Response The result of the actions of the effectors
Ectotherm An organism that cannot maintain it's own body temperature
Endotherm An organism that can maintain it's own body temperature
Negative feedback The effectors are 'switched off' due to conditions returning to optimum (normal)
Positive feedback The effectors are NOT 'switched off' and conditions will continue to be out of control (worsen)
Endocrine system Collection of glands of an organism that secrete hormones directly into the circulatory system to be carried towards a distant target organism.
Hormone A chemical messenger
Endocrine gland A gland that secretes substances directly into the blood
Exocrine gland A gland that secretes substances directly into a duct
Target tissue The tissue that is affected by a particular hormone
Pancreas An organ that contains both endocrine and exocrine tissue
Insulin A hormone that lowers the amount of glucose in the blood
Glucagon A hormone that raises the amount of glucose in the blood
Hepatocytes Liver cells
Created by: saltpopcorn