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BIOL 1003 (69)
Lecture

growth 2.docx

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Department
Biology
Course
BIOL 1003
Professor
Elizabeth Nisbet
Semester
Fall

Description
Longitudinal Study  Measures same person at regular intervals over a long period of time  Accurate picture of individual growth (+)  Measurements taken at different times can be compared  Not suitable for an investigation (-)  People leaf study area/lose interest in being involved in investigation  Migration/death  Takes a long time to see a pattern/conclusion Relatives rates of growth of tissues and organs from birth to adulthood  [GRAPH] Different parts of the body grow at different rates o Head and brain develop first → being ≈90% of its adult size by the age of 5  Before growth of bones and muscles in limbs  Thus, results in a change in body proportion o Reproductive system develops latest → remains below ≈20% until puberty o Lymphoid tissues (appendix, spleen, thymus gland) reach max size before puberty → size is o reduced to its adult size after puberty → reduction in size caused by sex hormones o Curve of the whole body is similar to an ABSOLUTE GROWTH GRAPH as height is an o indicator of general body size  Different growth rates result in changes in shape during embryological and post-natal growth Puberty Physical And Endocrine Changes Associated With Puberty  Growth spurt occurs earlier in girls but is larger in boys  Sex hormones (testosterone; oestrogen + progesterone) cause o Development of internal reproductive organs and 2° sexual characteristics o Increase activity of sweat and sebaceous glands  Blocked sebaceous glands cause acne  Changes the relative amounts of prot
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