lgn custom essays (3 essays)

The person must then continue to use the drug in to feel normal , or its absence will trigger the symptoms of withdrawal . Psychological dependency occurs when a drug has been used habitually and the mind has become emotionally reliant of its effects , either to elicit pleasure or relieve pain , and does not feel capable of functioning without it . Its absence produces intense cravings , which are often brought on or magnified by stress . A dependent person may have either aspects of...

There have been a number of researches done to find out how the brain is able to store memory , where it is stored , how the memory works , how the short-term memory is converted to long-term memory and what happens when we recall these memories . Short-term memory or working memory is made up of facts or data that a person needs to retrieve in a matter of seconds , minutes or an hour . For example , when we are watching the telly and...

It is caused by a differential distribution of electric charges across the membrane of the cell , living the inside of the cell membrane negative in comparison to the outside . The value of the membrane potential in a given nerve cell may vary from -40 to -80 in different nerve cells . In this process , neurons and muscle cells , can serve as a signaling mechanism . This also results in an input signal which is known as synaptic potential . Receptor potential is also...