Homeostasis

1. Movement of molecules down their concentration gradient. It may be through a partially permeable membrane. (9)
4. A substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction. (6)
8. The surroundings of the cell, ie. tissue fluid, is described as an organism's ___ environment. (8)
9. Any change in the environment of an organism that causes a response. (8)
10. Substances that have the capability of causing harmful effects. (6)

2. Organisms that can control production and loss of heat to maintain their body temperature. (10)
3. Cells that bring about a response to reverse changes detected by receptor cells. (8)
5. A process in which any change in a parameter brings about an increase in that change. The process is ___ feedback. (8)
6. The constriction of blood vessels which restricts blood into capillaries at the skin's surface, reducing heat radiation, thus keeping more of the body's heat. (16)
7. A new material formed in a chemical reaction. (8)

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