People who suffer from attention-deficit/hyperactivity disorder (ADHD) tend to have unusually low levels of dopamine.
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ADHD is a brain disorder characterized by problems in paying attention and excessive activity and it is suggested that lower levels of dopamine (elevated number of dopamine transporters) are associated with symptoms of ADHD. ADHD is associated with functional impairments of dopamine pathways and also norepinephrine pathways because these pathways are responsible for modulating <span>executive function<span> (cognitive control of behaviour).</span></span></span>
Answer:
autonomic nervous system (ANS)
Explanation:
The Autonomic Nervous System (SNA) is the part of the nervous system that controls and regulates internal organs such as the heart, stomach and intestines, without the need for conscious effort by the body. It is part of the peripheral nervous system (which includes the Somatic Nervous System or SNS and SNA) and for this reason it also controls some of the body's muscles.
Thus, most organs are controlled by the sympathetic and parasympathetic nervous system. Sometimes both have opposite effects on the same organ. For example, the sympathetic system increases blood pressure while the parasympathetic system decreases it. In general, both systems work together to ensure that the body responds adequately to different situations.
Answer:
Increased levels of phosphate are beneficial to phytoplankton and aquatic plants. In the short-run, this means increased micronutrients for herbivorous and omnivorous fish.
The phosphate, however, reacts with the water to reduce the oxygen levels obtainable in the water. Without oxygen, the fishes die off.
It is not unusual to find that with increased phosphate in water, healthy fishes begin to die off without any other plausible explanation.
The solution is to clean the water or treat it with solutions that impact positively whilst reducing the phosphate levels.
Cheers!