What type of membrane protein involves the long-term restoration of the concentration gradient?

in a resting neuron, there are concentration gradients across the membrane for ... (Yes, that's kind of gross, but let's just imagine it for a second.) ... Instead, they have to use specialized channel proteins that provide a ... Because the system is in equilibrium, the membrane potential will tend to stay at the equilibrium potential.

Explanation:

the answer to your question is tooth decay.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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