The evolution of anti-drug laws: treatment for drug users and addicts in Brazil and in Portugal. In , Portugal, also concerned with the dignity of drug addicts and users, showed a more innovative attitude than that of Brazil, decriminalizing the use of small quantities of drugs. Despite legal changes in Brazil, public health programs that deal with the drug problems in that country remain incipient.
Communication is a process in which a sender transmits signals to one or more receivers to control and coordinate actions. Together, these two systems are primarily responsible for maintaining homeostasis in the body. The nervous system uses two types of intercellular communication-electrical and chemical signaling-either by the direct action of an electrical potential, or in the latter case, through the action of chemical neurotransmitters such as serotonin or norepinephrine.