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Cell Communication

Communication between Cells

Why is communication between cells so important? Without it, the body environment would be unstable and unable to function.
What is homeostasis? The maintenance of a relatively stable internal environment.
What is Negative feedback? A change in a variable (eg drop in body temperature) and an action to produce a change in the opposite direction. Negative - opposite
What is Positive feedback? Procedure that increases further change in variable that brought on the initial change.
What are signalling molecules? Used by cells to communicate.
What are the 4 different types of signalling molecules? Autocrine, Paracrine, Endocrine and Exocrine.
How can signalling molecules be classified? By the distance between the cell that releases the signalling molecule and the target cell.
What is Autocrine? When target cell is same cell releasing the signal molecule.
What is Paracrine? When target cell is nearby to the cell releasing the signal molecule.
What is Endocrine? When target cell is far away to the cell releasing the signal molecule.
What is the Exocrine? When the target cell is outside the organism.
In terms of controlling blood glucose levels, what is the role of insulin? Controls uptake by the cells of glucose from the blood.
In terms of controlling blood glucose levels, what is the role of glucagon? Acts on the liver to release more glucose into the blood.
Created by: zarap103



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