Question

the brain is a very complex organ that operates with amazing efficiency. the limbic system of the brain senses and regulates emotions and communicates with the parts of the brain that are involved in memory, perception, thought, and consciousness. neurotransmitters are chemical messengers that carry signals from one neuron to another neuron or another kind of body cell. one of the primary neurotransmitters in the limbic system of the brain is dopamine. when dopamine is released and available, it causes an individual to feel pleasure, and that pleasure is a motivator for behavior. feelings of pleasure are essential to survival since they reinforce the need to eat, exercise, develop relationships, and have self - efficacy. drugs of abuse interfere with the normal action of dopamine. they block its production, enhance its effects, or suppress its actions. for instance, cocaine changes the normal chemical balance in the brain and can affect judgment, decision making, emotional perceptions, and other brain functions since it interferes with normal dopamine action. adam is a cocaine addict and has used for 5 years. he has tried to quit, but experiences severe depression and inability to concentrate that interferes with his doing his job as a stock analyst when he stops using cocaine. he believes that the cocaine is enhancing his abilities and that he needs to continue using in order to function in his fast - paced work environment. what effects of cocaine on dopamine production and activity in the brain is adam experiencing? view available hint(s) cocaine is decreasing the production of dopamine in the limbic system and creates a calm emotional state that helps adam concentrate despite the chaotic work environment around him. cocaine is preventing dopamine from being reabsorbed by the neurons so that there is more present in the brain, and the brain has become dependent on this increased concentration to produce pleasure and stimulate brain function. cocaine is increasing the production of dopamine in the limbic system and that reinforces adams cognitive abilities, allowing him to think clearly. cocaine is having no effect on dopamine, but is enhancing adams ability to think clearly by increasing his concentration.

Explanation:

Cocaine blocks the re - uptake of dopamine, preventing it from being reabsorbed by neurons. This leads to an increased concentration of dopamine in the synaptic cleft, and the brain becomes dependent on this elevated level for normal function and pleasure - seeking behavior.

Answer:

B. Cocaine is preventing dopamine from being reabsorbed by the neurons so that there is more present in the brain, and the brain has become dependent on this increased concentration to produce pleasure and stimulate brain function.