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This question is one of the core questions in biology that many thousands of biologists are trying to answer. Although we have made huge progress since DNA was discovered there is still a lot that isn't k...

Looking at a cholinergic synapse:The action potential arrives at the presynaptic knob. This causes voltage-gated calcium ion channels to open, and calcium ions to diffuse into the presynaptic knob.The inf...

The arrival of an action potential at the end of the presynaptic neurone causes Ca²⁺ protein channels to open Ca²⁺ ions diffuse into the synaptic knob by facilitated diffusionCa^...

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...