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Samenvatting hoofdstuk 2 groei en ontwikkeling

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samenvatting van 2e hoofdstuk groei en ontwikkeling van Hans

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December 4, 2022
Number of pages
16
Written in
2022/2023
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Hoofdstuk 2: Somatische groei
 Inleiding: 4 groeicurves


relatieve (%) massa van weefsel ten opzichte van volwassen waarde (0-
20 jaar).




o Groeicurve reproductieve weefsels
 beperkte groei 0-2 jaar
 stabiliteit 2-12 jaar
 exponentiële, sterke groei tijdens puberteit (12-14jaar) tot volwassen
waarden zijn bereikt
 Weefsels: primaire en secundaire geslachtskenmerken, geslachtshormonen




o Algemene groeicurve
 langgerekte S-curve (sigmoidaal)
 snelle groei gedurende eerste levensjaren
 geleidelijke groei in kindertijd (6-12jr)
 versnelde groei tijdens puberteit (12-14jr)
 afvlakking naar volwassenheid
 Weefsels: meeste extern meetbare dimensies (gestalte, gewicht, spiermassa,
skelet), cardiorespiratoir systeem (hart, bloedvaten, longen,…),
verteringssysteem, blaas.
 Uitzondering: vetmassa, bovendeel van gezicht

, o Neurale groeicurve
 snelle groei gedurende eerste levensjaren
 90% van volwassen massa wordt bereikt op 5-6 jaar, 95% op 7 jaar
 minimale groei (5%) na 7 jaar tot volwassen waarden worden bereikt
 Weefsels: hersenen, zenuwstelsel, ogen, bovendeel van gezicht




o Lymfoïde groeicurve
 snelle groei tot puberteit
 bij aanvang puberteit: 200% van volwassen waarde
 daarna afname tot volwassen waardes (krimpen van thymusweefsel,
verhoogd bindweefsel)
 Weefsels: hoofdzakelijk thymus, lymfeklieren, -knopen (immunologisch
systeem)
 Wat met thymus bij volwassenen? Toch mogelijk T-cel productie, verhoogde
activiteit in AIDS patiënten (anti-aging drug)




 Somatische Groei

, o Afstandscurves lengte/gewicht
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