A nerve impulse is propagated across a synapse when the neurotransmitter acetylcholine is released from the pre-synaptic membrane and diffuses across the 20-nm-wide synaptic cleft to the post-synaptic membrane.a. How long does it take a nerve signal to cross a synapse? You can assume that the synaptic fluid is essentially water.b. What is the speed of transmission, in m/s?

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Density of Solids

The density of a substance refers to how much matter is present in a given amount of space. It is expressed as the ratio of the mass of the substance to its volume.