Homeostasis revision

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Define homeostasis
The maintenance of the internal environment in a constant state
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Define negative feedback
Process that brings about a reversal of any change in conditions
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Define positive feedback
Process in which any change in a parameter brings about an increase in that change
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What is an endocrine gland
A gland that secrets hormones
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Define exocrine gland
Gland that secretes molecules into ducts
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Explain the meaning of the first messenger
A hormone that acts as a message in the bloodstream
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Explain the meaning of the second messenger
A chemical inside the cell released in response to a hormone binding to the cell surface membrane.
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Name the endocrine tissue found in the pancreas
Islet Of Langerhons
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Name the hormone produced by alpha cells.
Glucagon
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Name the hormone produced by beta cells
Insulin
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What is the pancreatic duct?
Small tube that collects all secretions from the exocrine cells in the pancreas and carries the fluid to the small intestine
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What happens when blood glucose level is too low?
Detected by the alpha cells, Glucagon secretion, liver converts glycogen to glucose (glycogenolysis), releases glucose to blood, Gluconeogenesis- amino acids and fats to glucose
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What happens when blood glucose get too high
Detected by beta cells in the islet of Langerhans, Insulin released by pancreas, increases permeability of cell surface membranes to glucose, rate of glucose absorption and respiration increase, glycogenesis- glucose to glycogen and stored in liver.
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Other cards in this set

Card 2

Front

Define negative feedback

Back

Process that brings about a reversal of any change in conditions

Card 3

Front

Define positive feedback

Back

Preview of the front of card 3

Card 4

Front

What is an endocrine gland

Back

Preview of the front of card 4

Card 5

Front

Define exocrine gland

Back

Preview of the front of card 5
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