Dopamine is a chemical released by neurons to send signals to other nerve cells. the brain includes several distinct dopamine pathways, one of which plays a major role in reward motivated behavior.
smoking is a habit, in a habit there is the cue, routine, and reward. with smoking the cue can be different things, most commonly stress or anxiety. the routine how you react to those cues, the reward is the chemical 'triggers' that are pulled inside you're brain leaving you feeling calm, happy, or relieved, etc.
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Active uptake (which I think you mean active transport) is important when the concentration gradient is against that of a certain substance, so it doesn't cross the membrane through diffusion or passive transport. It is sometimes necessary if a substance needs to move across a membrane but can't do so due to electrical charge or that there is a substance on the other side of the membrane preventing diffusion.
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your answer is tape worm i know this because tapeworms take over inside of a host and its body is smooth and soft.
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<span>Procedural memory is the type of long term memory that would be the last to be affected in a person with Alzheimer's disease. This type of memory operates on an unconscience level that the person does almost automatically because it draws from long term memories to perform an action without thinking about doing it.</span>
