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8/14/2019 Name: Fatin Najiha Abu Bakar Class : 2 Feminin 2009
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O
THName: Fatin Najiha Abu BakarClass : 2 Feminin 2009
Title : Growth Chapter 5
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growth
1. Growth is a life process that occurs in all types of life.2. Growth can be defined as: > Increase in body size > Increase in number of cells > Increase in weight
> Changes in body shape > Changes in function of an organism
3. The growth of an unicellular organism involves: > Increase in size of a cell > Increase in mass of a cell
4. The growth of a multi cellular organism involves: > Increase in the number of cells > Increase in the size of the organism especially in: a) height b) weight
1.2.
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> Changes in appearance > Changes in physical characteristics > Develop the complexity and function of the
organism5. The process of growth in an organism is permanent and
irreversible.
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The characteristic of human
growth
1. The human growth pattern is asigmoid curve.
2. It is divided into five stages of
growth: a) Infancy b) Childhood c) Adolescence d) Adulthood e) Old age
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1. The human growth curve is obtained byplotting the height or weightagainst time.
2. The rate of growth is the difference inweight at suitable over a period oftime.
3. Therefore, the gradient of the curveindicates the rate of that particularperiod.
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INFANCY - CHILDHOOD ADOLESCENCE
ADULDHOOD - OLD
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1. The rate of growth in human is the fastest, during: a) the development of foetus in the uterus. b) the first six month after birth
2. An infant grows very quickly in the first three year.3. Childhood is a period of slow growth.
4. The adolescence is a period of very quick growth a)Sexual maturity or puberty is achieved during
adolescence
b) The teen years are adolescent period5. Adulthood covers the early 20s until about 65. It is of
minimal growth.
6. Old age is the period of negative growth. a) negative growth means loss in weight b) tissues in the body break downs more quickly than
they can be repaired
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Stages Growth pattern
Infancy( early stage )
0 to 3 years
Rapid growth until three years of ageWeight doubles after six monthsWeight triples after one year
Childhood
3 to 12 year of ageSlow growth until adolescent stage
Adolescence12 to 20 years of ageTeen yearsGrowth rate increaseSexual maturity or puberty achieved during
this stageAdulthood
Starts from about 20 years of ageGrowth rate slows downMaximum growth achieved and growthstops
Old ageGrowth rate becomes negativeHeight and weight decrease slightly
Death at old age
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Stages Comparison
Infancy( early stage )
Growth rates for baby and girls are generally
the sameChildhood
From fouryears old a boys growth rates is fasterthan a girlsterm of weight
Adolescence Girls reach puberty at the age of 12
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