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The increased pressure caused by the stimulus opens pressure gated sodium ion channels allowing Na+ ions to diffuse (down a concentration gradient) into the axon. This sudden influx of Na+ ions causes a l...

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 me...

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)

This question is asking you to explain how action potentials travel across neuromuscular junctions and how the closure of calcium ion channels would prevent the signal travelling across the junction, so w...

Membrane proteins on the inner membrane of the mitochondria carry the electrons from the reduced NAD and FAD along the membrane, causing the electrons to lose energy as they move down their energy levels....