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HSCI 216 (49)


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Health Sciences
HSCI 216
Pablo Nepomnaschy

HSCI216: Lecture XI Growth & Development  Catch-up Growth: height velocity above the limits of normality for age and/or maturity during a defined period of time, following a transient period of growth inhibition o Once the inhibitor is removed, they can catch up  Early Developing o It is dangerous for males to look like an adult when not  As they do compete with others of their gender o Women mature earlier because it will increase their chances to reproduce before they die o Girls who live with their step-father, will mature earlier than those living with their biological father  Sexual molestation more likely with step-fathers, also murder (even though the risk is low, it is still higher than biological)  Ex: lions taking over female colony then kill the females offspring for many reasons  Late Developing o  catch up growth o growth can be fostered by a drastic change in environment  ex: of girl once adopted her growth spurts greatly o Growth hormone insufficiency (genetic origin)  Growth in adolescence and puberty o Puberty: onset of reproductive, physical and behavioral changes leading to adulthood (recognize the three changes) o Adolescent growth spurt: onset of pubertal growth spurt is earlier in girls than boys  Girls: 10-13, boys: 15-17 (there is a distribution as well)  Girls stop growing early as well  If you grow later, you grow from a higher stature, therefore taller at the end\  Sexually dimorphic: one form for females, another for men  Boys grow for longer period of time o Tempo of growth during adolescence: variation between populations in growth, no correlation between timing of growth spurt and final stature, genetic control for tempo of growth  All same age, but develop at different rates  Puberty: transition from growth maintenance  reproduction maintenance o At the end of reproduction maintenance we senesce o Timing of puberty is sensitive to internal (developmental) and external (ecological) o Precise proximate determinants remain obscure  Ultimate: delay will help living conditions from previous generations  Hypothalamic-Pituitary-Gondal (HPG) axis (the hypothalamus & pituitary gland) driving factors for puberty o Hypothalamus: control center for HPG axis (gonads  testicles and ovaries), through gonadotropin-releasing hormone or GnRH  Tropin = growth, increase e
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