Communication and Homeostasis 0.0 / 5 ? BiologyHuman, animal and plant behaviourA2/A-levelOCR Created by: zooandrooCreated on: 11-01-15 12:15 Exocrine Gland A gland that secretes substances into a duct 1 of 9 Endocrine Gland A gland that secretes hormones directly into blood capillaries 2 of 9 α cells Produce glucagon - Causes blood glucose levels to rise 3 of 9 β cells Produce insulin - Causes blood glucose levels to fall 4 of 9 Negative feedback A process that brings about the reversal of any change in conditions. 5 of 9 Positive feedback A process that increases the impact of any change detected by the receptors. 6 of 9 Ectotherm An organism that relies on external sources of heat to regulate its body temperature 7 of 9 Endotherm An organism that can use internal sources of heat, such as heat generated from metabolism in the liver, to maintain its body temperature. 8 of 9 Homeostasis The maintenance of a constant internal environment despite external changes. 9 of 9
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