Given the distance between the presynaptic and post‐synaptic cell at a neuromuscular junction is 50 nanometers:
a) how long (in seconds) would it take the neurotransmitter, acetylcholine, to diffuse to the post‐synaptic cell following its release from the presynaptic cell? the diffusion coefficient for acetylcholine is 4*10‐6 cm2 /second.
b) what would happen to the time if the distance doubled? tripled?
c) how long would it take for a larger neurotransmitter like dopamine (d= 1.6 *10‐7 cm/sec)?

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electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

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