Changes

: [[Hormone]]s take longer to travel around the body than [[Impulse (Biology)|electrical impulses]].

: The effect of [[hormone]]s can be persistent while the [[Impulse (Biology)|elecrtrical impulses]] are instantaneous.

===References===

:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Hormones; menstrual cycle, pages 148-149, GCSE Biology, Pearson, Edexcel '']

:[https://www.amazon.co.uk/gp/product/1782948120/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948120&linkCode=as2&tag=nrjc-21&linkId=dedef775c6a43dbb0a609441525adac0 ''Hormones; plant hormones, pages 215-219, GCSE Biology, CGP, Edexcel '']