Find in this article Print article Send us feedback More Media (4 items) Article Outline Introduction, Classification, Structure and Physiology, Behavior, Cultural Attributes, Other Definitions I. Introduction Print section Human, common name given to any individual of the species Homo sapiens and, by extension, to the entire species. The term is also applied to certain species that were the evolutionary forerunners of Homo sapiens (see Human Evolution).
Scientists consider all living people members of a single species. II. Classification Print section Advertisement Homo sapiens is identified, for purposes of classification, as an animal (kingdom Animalia) with a backbone (phylum Chordata) and segmented spinal cord (subphylum Vertebrata) that suckles its young (class Mammalia); that gestates its young with the aid of a placenta (subclass Eutheria); that is equipped with five-digit ed extremities, a collarbone, and a single pair of mammary glands on the chest (order Primates); and that has eyes at the front of the head, stereoscopic vision, and a proportionately large brain (suborder Anthropo idea).
The species belongs to the family Hominidae, the general characteristics of which are discussed below. III. Structure and Physiology Print section The details of skeletal structure distinguishing Homo sapiens from the nearest primate relatives-the gorilla, chimpanzee, and orangutan-stem largely from a very early adaptation to a completely erect posture and a two-footed striding walk (bipedalism).
The Essay on Issues That Surround The Dramatic Declines Of Species Are Complex
Issues that surround the dramatic declines of species are complex, often conflict-laden, and not easy to reverse. However, one can learn from past practices, improve performance, and avoid the problems common to endangered species conservation. Outline Introduction Body Species extinction causes Florida panthers Tigers and snow leopards Turtles Conclusion Endangered Wildlife As human population ...
The uniquely S-shaped spinal column places the center of gravity of the human body directly over the area of support provided by the feet, thus giving stability and balance in the upright position.
Other mechanical modifications for bipedalism include a broad pelvis, a locking knee joint, an elongated heel bone, and a lengthened and aligned big toe. Although varying degrees of bipedalism are seen in other anthropoids, all have straight or bowed spines, bent knees, and grasping (prehensile) feet, and all use the hands to bear part of the body weight when moving about. Complete bipedalism in the human freed the hand to become a supremely sensitive instrument for precise manipulation and grasping. The most important structural detail in this refinement is the elongated human thumb, which can rotate freely and is fully opposable to the other fingers.
The physiological requirements for speech were secondarily established by erect posture, which positions the vocal cords for controlled breathing, and by the skilled use of the hands. The latter development occurs in association with the enlargement and specialization of a brain area (Broca’s convolution) that is a prerequisite for refined control of the lips and tongue. Continue article… Advertisement Bear Print Snow Shoes$19. 99 Discovery store.
com more like this… The M othman Prophecies John A. Keel Save up to 40%The large (averaging 1400 cc/85. 4 cu in) brain of Homo sapiens is approximately double that of early human toolmakers. This great increase in size in only 2 million years was achieved by a process called neoteny, which is the prolongation of retention of immature characteristics. The juvenile stage of brain and skull development is prolonged so that they grow for a longer period of time in relation to the time required to reach sexual maturity.
Unlike the early human adult skull, with its sloping forehead and prominent jaw, the modern human skull-with biologically insignificant variations-retains into maturity a proportionately large size, in relation to the rest of the body, a high-rounded dome, straight-planed face, and reduced jaw size, all closely resembling the characteristics of the skull in the juvenile chimpanzee. Its enlarged dimensions required adaptations for passage through the birth canal; consequently, the human female pelvis widens at maturity (with some sacrifice in swiftness of locomotion), and the human infant is born prematurely. Chimpanzees are born with 65 percent of their adult brain capacity; Australopithecine, an erect, tool-using near-human of 3 million years ago, was born with about 50 percent; modern human newborns have only 25 percent of adult brain capacity, resulting in an extended period of helplessness. The many neurological pathways to the rapidly growing brain must be organized and coordinated during a prolonged period of dependency on and stimulation by adults; lacking this close external bond in the early years of life, development of the modern brain remains incomplete.
The Essay on First Year Brain Years Child
The human brain is a portion of the central nervous system and serves as the control center for movement, sleep, hunger, and virtually everything else vital and necessary to survive. Not only that, but the brain also controls all human emotions from fear and love, to elation and sorrow. It also receives and interprets countless signals from other parts of the body and the outside environment. ...
IV. Behavior Print section The physiological adaptations that made humans more flexible than other primates allowed for the development of a wide range of abilities and an unparalleled versatility in behavior. The brain’s great size, complexity, and slow maturation, with neural connections being added through at least the first 12 years of life, meant that learned behavior could largely modify stereotyped, instinctive responses. New environmental demands could be met by rapid adjustments rather than by slow genetic selection; thus, survival in a wide range of habitats and under extreme conditions eventually became possible without further species differentiation.
Each new infant, however, with relatively few innate traits yet with a vast number of potential behaviors, must be taught to achieve its biological potential as a human. V. Cultural Attributes Print section The human species has a unique capability for culture in the sense of conscious thinking and planning, transmission of skills and systems of social relationships, and creative modification of the environment. The integrated patterns of behavior required for planning and fashioning tools were accomplished at least 2. 5 million years ago, and some form of advanced code for vocal communication may also have existed at this time. By 350, 000 years ago planned hunting, fire making, and the wearing of clothing were well established, as was possibly ritualized disposal of the dead.
The Essay on Biodiversity Species Humans Wilson
'BIODIVERSITY' Biodiversity, as defined by E. O. Wilson, 'is meant to be all inclusive-it's the genetic based variation of living organisms at all levels, from the variety of genes in populations of single species, through species, on up to the array of natural ecosystems.' This includes plants, animals, insects, fungi, bacteria, and all microorganisms. All of these things create what is known as ...
Evidence of religion, recorded events, and art date from 30, 000 to 40, 000 years ago and imply advanced language and ethics for the complex ordering of social groups required for such activities. From about that time the genus Homo began to stabilize into the one generalized species of Homo sapiens. VI. Other Definitions Print section The preceding description rests on anatomical observation (see Anatomy) and current scientific theory on the origin of the Homo species. Humankind itself and the essence of being human are also defined in many other ways-religious, social, moral, and legal. See Anthropology; Psychology..
