F214 Communication and Homeostasis 1.5 / 5 based on 2 ratings ? BiologyCommunication and homeostasisA2/A-levelOCR Created by: Chloe ReidCreated on: 06-06-15 14:54 Negative feedback a process in which any change in a parameter brings about the reversal of that change so the parameter is kept fairly constant 1 of 9 Positive feedback a process in which any change in a parameter brings about an increase in that change 2 of 9 Homeostasis the maintenance of constant internal environment despite external changes 3 of 9 Endocrine gland a gland that secretes hormones directly into blood capillaries 4 of 9 Exocrine gland a gland that secretes substances into a duct 5 of 9 Hormone a molecule released into the blood that acts as a chemical messenger 6 of 9 Target tissue a tissue that has specific receptors embedded in the plasma membrane that are complementary in shape to specific hormone molecules 7 of 9 First messenger a hormone that acts as a message in the bloodstream (e.g. adrenaline) 8 of 9 Second messenger a chemical inside the cell released in response to a hormone binding to the cell surface membrane (e.g. cAMP) 9 of 9
A2 Biology Communication, Homeostasis and Energy (OCR F214) 5.0 / 5 based on 1 rating Teacher recommended
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