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1. Action potential arrives at axon terminal of presynaptic neuron

2. Voltage-gated Ca2+ channel opens

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ATP is bound to the myosin head to cause detachment of the head from the actin filament, the ATP is then hydrolysed and as a result the myosin head reattaches to the actin filament. The now hydrolysed ATP...

Most water reabsorption takes place in the proximal convoluted tubules, part of the nephrons in the kidney. Water is reabsorbed by a process called osmosis; the diffusion of water from an area of high wat...

DNA is a double stranded macromolecule which is composed of nucleotides . The two DNA stands, joined by hydrogen bonds between the nucleotides and running antiparrallel to each other form a double helix s...

This system is made up of two main components: the heart and the vasculature.  The heart is an organ with two sides, each of which is dedicated to carry out a different job.  The right side receives deoxy...