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The arrival of an action potential at the end of the presynaptic neurone causes Ca 2+ protein channels to open Ca 2+ ions diffuse into the synaptic knob by facilitated diffusionCa 2+ ions cause synaptic vesi...

If blood vessels are damaged, such as by a cut in the skin, blood clots to perform two functions. 1) to reduce or stop blood loss2) to prevent the entry of pathogens This triggers a cascade of events, result...

There are many similarities between these two cells but some important differences which are specific to plant cells. Some of the shared organelles include:Cell Membrane - made of a lipid bilayer which prote...

Will be easier to explain with whiteboard!a) Let y = arcsin x. sin y = x cos y dy/dx = 1 dy/dx = 1/(cos y) dy/dx = 1/(√ (1 - sin 2 y)) dy/dx = 1/(√( 1 - x 2 )) as required.b) 4 - 2x - x 2 = - (x 2 + 2x - 4) ...

Osmosis is the net movement of water from an area of high water potential to low water potential through a semi-permeable membrane, while diffusion is the net movement of any liquid or gas from an area of hi...