In order to detect a signal (that is, to be a target cell), a neighbor cell must have the right receptor for that signal. When a signaling molecule binds to its receptor, it alters the shape or activity of the receptor, triggering a change inside of the cell. Signaling molecules are often called ligands, a general term for molecules that bind specifically to other molecules (such as receptors).
A chunk paragraph is just a way of developing your skill in writing - it is a style or format which forces you to explain your ideas and arguments. Here's you do chunk writing: Write your topic sentence.
Chunking, at its simplest, is the organization of information into specific associated groupings. Graybiel hypothesizes that the basal ganglia system helps the cortex to chunk learning into habits and routines to help the brain more quickly access stored information.raybiel and colleagues also found a group of nerve cells in the striatum that are not firing in the same way as the others.hunking, at its simplest, is the organization of information into specific associated groupings. Graybiel hypothesizes that the basal ganglia system helps the cortex to chunk learning into habits and routines to help the brain more quickly access stored information.