We get tired after exercise because our muscle fibers get tired very quickly. This is due to the major source of energy for the muscle tissue, called adenosine triphosphate, or ATP. As the muscles make use of this supply of energy, they get tired and fatigue.
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c Your kidneys and liver might not function properly
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Forms of passage of substances across the blood–brain barrier. (A) Passive diffusion: fat-soluble substances dissolve in the cell membrane and cross the barrier (e.g., alcohol, nicotine and caffeine). Water-soluble substances such as penicillin have difficulty in getting through.
<u><em>syphillis</em></u> is an STD that is cause by a basterium called spirochete that attacks many parts of the body
<span> stimulants such as </span>dextroamphetamine act in the brain . Stimulants<span> enhance the </span>effects of chemicals in the brain
