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Firstly the resting membrane is set by Na+/K+ ATPase so that 3 Na+ moves out for every 2K+ that moves in; this creates a negative membrane potential of around -65mV. To initiate an action potential the membr...

Blood glucose levels start to fall in the blood. Blood flowing through the pancreas is low in glucose, and this is sensed by cells in the pancreatic tissue. In response, it produces glucagon, ( which is a ho...

Mitosis is the seperation of DNA. There are 4 stages of mitosis that you need to be aware of for A level Biology: Prophase, Metahase, Anaphase and Telophase. (I like to remember this order as P.Mat) During p...

A redox reaction is a reaction where both reduction and oxidation are happening simultaneously. Reduction is the gain of electrons, where as oxidation is the grian of elctrons. I like to remember this using ...

To solve an algebraic equation you need to rearrange it into the format x=? To do this there are a few rules and few steps R ules: whatever you add or subtract to one side you must also do to the other side ...