Homeostasis

1. The surroundings of the organism, ie. outside temperature, is described as an organism's ___ environment. (8)
4. The reaction to a stimulus. (8)
5. Organisms that rely on external sources of heat and behavioural activites to regulate their body temperature. (10)
6. Movement of molecules down their concentration gradient. It may be through a partially permeable membrane. (9)
8. A process in which any change in a parameter brings about the reversal of that change so the parameter is kept fairly constant. The process is ___ feedback. (8)
10. A hormone released by the posterior pituitary gland to facilitate birth and breastfeeding. (8)

2. Substances that have the capability of causing harmful effects. (6)
3. A cell can be described as ___ if it is specialised to perform a certain function. (14)
7. Organisms that can control production and loss of heat to maintain their body temperature. (10)
9. Some creatures posess ___ adaptations that help to regulate their body temperature, eg. horned lizards can alter their body shape to expose more or less surface area to the sun. (13)

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