A synapse is some type of structure located on a neuron, that makes the exange of information between neurons possible.
The two main part of the structure are the neurotransmitter transporter and the receptors, which send and recieve information respectively and are found in every nervous cell.
I have pasted an image below, so you can see how a synapse looks.
Hope it helped,
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The ATP molecule is a high energy molecule. When a molecule of ATP breakdown, it produces chemical as well as thermal energy. The type of energy produced is mainly depends on the application for example, if the ATP breaks down to ADP, it produces thermal energy and if couples with a cellular process it produces chemical potential.
Our body needs energy to carry out cellular functions and the energy produced in a form of ATP is taken by cells to perform functions.
It is C. Because the other 3 are in side of the the cell membrane to be protected.