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Deviation from homeostasis causes the activation of feedback loops in order to restore equilibrium to the organism. 

An example of a negative feedback loop is the homeostasis of blood glu...

Another proposed model is induced fit. This suggests that the substrate and active site are not a perfect match to each other. So inorder to fit together both the substrate and active site must change sha...

Very thin walls result in a short diffusion distance which makes gas exchange particularly favourable.

Lots of branches and sacs result in a large surface area so gas exchange can be maxi...

Exons are coding regions of DNA, and are copied into mRNA and transcribed as proteins.

Introns are non-coding regions of DNA, and are spliced out of pre-mRNA so are not copied into mRNA.<...

Homeostatis is the regualtion of the internal conditions of the body to ensure that everything remains balanced.