- Suriname (/ˈsʊərɪnæm, -nɑːm/ SOOR-ih-NAM, -NAHM, Dutch: [syːriˈnaːmə]), officially the Republic of Suriname (Dutch: Republiek Suriname [reːpyˌblik ˌsyːriˈnaːmə]), is a country in northern South America, sometimes considered part of the Caribbean and the West Indies. Situated slightly north of the equator, over 90% of its territory is covered by rainforests, the highest proportion of forest cover in the world. Suriname is bordered by the Atlantic Ocean to the north, French Guiana to the east, Guyana to the west, and Brazil to the south. It is the smallest country in South America by both population and territory, with around 612,985 inhabitants in an area of approximately 163,820 square kilometers (63,251 square miles). The capital and largest city is Paramaribo, which is home to roughly half the population.
- Nervous system (Wikipedia)
In biology, the nervous system is the highly complex part of an animal that coordinates its actions and sensory information by transmitting signals to and from different parts of its body. The nervous system detects environmental changes that impact the body, then works in tandem with the endocrine system to respond to such events. Nervous tissue first arose in wormlike organisms about 550 to 600 million years ago. In vertebrates it consists of two main parts, the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consists of the brain and spinal cord. The PNS consists mainly of nerves, which are enclosed bundles of the long fibers or axons, that connect the CNS to every other part of the body. Nerves that transmit signals from the brain are called motor nerves or efferent nerves, while those nerves that transmit information from the body to the CNS are called sensory nerves or afferent. Spinal nerves are mixed nerves that serve both functions. The PNS is divided into three separate subsystems, the somatic, autonomic, and enteric nervous systems. Somatic nerves mediate voluntary movement. The autonomic nervous system is further subdivided into the sympathetic and the parasympathetic nervous systems. The sympathetic nervous system is activated in cases of emergencies to mobilize energy, while the parasympathetic nervous system is activated when organisms are in a relaxed state. The enteric nervous system functions to control the gastrointestinal system. Both autonomic and enteric nervous systems function involuntarily. Nerves that exit from the cranium are called cranial nerves while those exiting from the spinal cord are called spinal nerves.
