영양과 성장 발달 - 기관별 세포의 성장 발달

• 영문명: Nutrition and Development -Cellular development of various tissues
• 발행기관: 국민대학교 교육연구소
• 저자명: 김선희(Kim Sun-Hee)
• 간행물 정보: 『교육논총』제8집, 149~169쪽, 전체 21쪽
• 주제분류: 사회과학 > 교육학
• 파일형태: PDF
• 발행일자: 1989.02.01

영문 초록

  Development is the sequence of the orderly changes from the fertilized egg to the adult. The changes are progressive and irreversible; they occur in a regular sequence with little variation, and each change leaves the organism different from and unable to return to its previous state. Growth is one aspect of development though growth refers to increase in size while development can occur without any change in overall size.   All nonregenerating organs reveals three distinct phases of growth. The first is characterized by a proportional increase in weight, protein, and DNA content; the number of cells is increasing whereas the ratios or the size of individual cells is not changing. Simple hyperplasia is occurring. This phase ends as the rate of net DNA synthesis begins to slow while weight and protein content continue to increase at the same rate, resulting in a transitional phase of hyperplasia and concomitant hypertrophy which lasts until net DNA synthesis stops. After this, all further growth is by hypertrophy.   If a developmental process be restricted by nutritional stress or other environmental insult, not only will this delay the process, but will restrict its ultimate extent. A restricting factor applied at a critical period will have a permanent effect. However, the effect of malnutrition or illness is not necessarily permanent. When an adequate diet is provided or health is restored, the child will grow at a speed greater than the average for his age. His stature therefore approaches the level it would have reached if the setback had not occurred. During "catch-up" the child"s growth rate may reach two or three times the average for his chronological age. The mechanism responsible for catch-up growth is not known.   The studies by examining the changes in cell number and cell size in various organs subjected to malnutrition at various stages of postnatal development demonstrated that the rate of cell division was slowed and the ultimate number of cells was reduced if malnutrition were imposed during the proliferative phase of growth. Moreover, this change could not be reversed once the normal time of all division has passed. In contrast, undernutrition imposed during the period when cells are normally enlarging will curtail the enlargement, but on subsequent rehabilitation the cell will resume their normal size.   Further studies should be done to investigate the mecharisms controlling the period during which DNA may be synthesized by an organ and the mechanisms governing the rate of synthesis during that period.

목차

Ⅰ. 서론
Ⅱ. 세포 성장의 단계와 시기
Ⅲ. 기관별 세포의 일반적 성장
Ⅳ. 기관별 세포 성장과 영양과의 관계
Ⅴ. 결론
〈참고문헌〉
〈Summary〉