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Neurons do not make direct contact but are separated by synapses. Impulses cross a synapse by means of a neurotransmitter. Describe the process of neurotransmitter release at a synapse. You may use a labelled diagram.

Action potential arrives at axon terminal of presynaptic neuron Voltage-gated Ca2+ channel opens Ca2+ enters the cell Ca2+ signals to vesicles Vesicles move to the membrane Neurotransmitters are released by ...
CM
Answered by Charlotte M. • Biology tutor
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How is ATP used in myofibril contraction?

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, i...
SW
Answered by Sam W. • Biology tutor
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State where most water reabsorption takes place in the kidney. State also the process by which the water is reabsorbed.?

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 water ...
DR
Answered by Dearbhail R. • Biology tutor
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Describe the structural differences between DNA and RNA.

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 stru...
AA
Answered by Annie A. • Biology tutor
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How does the circulatory system work?

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 deoxygenat...
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Answered by Nicholas W. • Biology tutor
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