growth chapter 5 form 3
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science form 3 notesTRANSCRIPT
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Chapter 5: GrowthChapter 5: Growth
5.1 Pattern of Human 5.1 Pattern of Human GrowthGrowth
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How Growth Is Measured?How Growth Is Measured?
Growth is an increase in Growth is an increase in body size, number body size, number of cells, appearance& weight.of cells, appearance& weight.
It’s also a change in the It’s also a change in the body shape & body shape & body function of an organism.body function of an organism.
Growth is Growth is irreversible & permanent.irreversible & permanent. Human growth rate is usually measured in Human growth rate is usually measured in
terms of terms of height & weight.height & weight.
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Infancy Infancy
- Growth rate is rapid in infancy- Growth rate is rapid in infancy ChildhoodChildhood
- Children experience a slower growth rate- Children experience a slower growth rate AdolescenceAdolescence
- The growth rate of an adolescent is faster - The growth rate of an adolescent is faster than that of a childthan that of a child
AdulthoodAdulthood
- The growth rate of an adult is almost zero- The growth rate of an adult is almost zero Old age/agingOld age/aging
- Negative growth rate- Negative growth rate
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Growth From The Aspects Of Height & Growth From The Aspects Of Height & Body WeightBody Weight
The differences in the growth rate of boys & girls as The differences in the growth rate of boys & girls as follows:follows:
(I) In infancy (0-2 years)(I) In infancy (0-2 years) - Boy’s growth rate = girl’s growth rate- Boy’s growth rate = girl’s growth rate(II) In childhood (2 – 12 years)(II) In childhood (2 – 12 years) - Boy’s growth rate faster than girl’s growth rate- Boy’s growth rate faster than girl’s growth rate(III) In adolescence (12 -14 years)(III) In adolescence (12 -14 years) - Girl’s growth rate faster than boy’s growth rate- Girl’s growth rate faster than boy’s growth rate(IV) In adulthood (14 – 19 years)(IV) In adulthood (14 – 19 years) - Physical growth in girls stop at 17 yrs age, in boys - Physical growth in girls stop at 17 yrs age, in boys
at 18 years of age.at 18 years of age.
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Effects of Nutrition On The Growth Of ChildrenEffects of Nutrition On The Growth Of Children Proper nutrition is necessary for Proper nutrition is necessary for healthy mental & physicalhealthy mental & physical growth in growth in
childrenchildren.. Lack of nutrients in a child’s diet results in Lack of nutrients in a child’s diet results in stunted growth.stunted growth.
NutrientNutrient ImportanceImportanceProteinProtein Builds new tissues in the bodyBuilds new tissues in the body
Carbohydrates & fatCarbohydrates & fat Supply energy because children are Supply energy because children are very activevery active
Calcium, phosphorus & Calcium, phosphorus & Vitamin DVitamin D
Form strong bones & teethForm strong bones & teeth
IronIron Forms haemoglobin in red blood Forms haemoglobin in red blood cellscells
VitaminsVitamins Build body’s defence against Build body’s defence against infections diseasesinfections diseases
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