<span>Cocaine is an indirect agonist of dopamine <span>receptors which</span> means he </span>has no specific agonist activity at the dopamine receptor<span> but he enhances his activity. Cocaine</span> acts by binding to the dopamine transporter, blocking the removal of dopamine from the synapse and blocking termination of dopamine signalling. As a result, it increases the extracellular concentration of dopamine and therefore signal to the receiving neurons is amplified.
Answer:
When it stands the test of time and is supported by many experiments.
The region of the greatest tornado activity shifts northwards from early spring to summer because the cold air reaches the boundary for expansion at the Gulf and as spring approaches, the days grow longer which allows for more heating from the sun. When this happens the temperatures on the ground will typically go up, and the warm, moist air from the Gulf of Mexico will push the cold air back up. During this time of activity the region for this sever weather area will move eastward around the southeastern Atlantic states. During this time the southeastern Atlantic states will have a peak of activity around April. When the spring air advances, the region for tornado activity will gradually shift to the west and will eventually then move northward.<span />
The pix shows that it has layers
I think because it's not a differentiated cell