There are a variety of situations that require a tooth to be restored with a dental crown. The following are the most common: Large filling: When a tooth has a cavity or fracture that involves half the width of the tooth or more, it needs to be covered with a crown. This is because the remaining tooth around the large filling is so weak that it is prone to fracture. Sometimes a large filling that has been in the mouth for a while will need to be replaced with a crown because the tooth shows signs of stress and cracks around the filling.
How marijuana affects the mind. Marijuana reaches the same pleasure centers in the brain that are targeted by heroin, cocaine and alcohol. Depending on the quantity, quality and method of consumption, marijuana can produce a feeling of euphoria â or high â by stimulating brain cells to release the chemical dopamine.
Marijuana Effects-Brain Effects of Marijuana. It was not until the 1990s that cannabinoid receptors in the brain, responding to THC, were discovered. Marijuana affects the brain primarily through these cannabinoid receptors, known as CB1 and CB2.CB1 receptors are found, primarily, throughout the brain.Through THC's interaction with CB1, marijuana effects brain areas relating to higher functioning, memory, cognition, movement and brain reward. CB1 receptors are also responsible for brain effects of marijuana involving:ver 400 active compounds have been found in the cannabis plant, 60 of which are unique to marijuana. The chemical compounds found in cannabis are collectively known as cannabinoids. Marijuana affects the brain primarily through the psychoactive compound delta-9-tetrahydrocannanbinol (THC), referred to as THC.