Ca 2+ is a highly versatile intracellular signal that operates over a wide temporal range to regulate many different cellular processes. This signalling system uses 'on' reactions that introduce Ca 2+ ...

Homeostasis is the result of variables being regulated such that the internal environment remains stable and fairly constant even though the external environment varies. For example, in humans, the pH ...

Try these interactive flashcards based on GCSE biology past papers. By working your way through the flashcards created by experts, you can prepare for your biology exams and make your revision more ...

Negative feedback control brings about changes that help return the body to normal conditions. If the body temperature drops, negative feedback control raises the temperature back to normal. If the ...