Class Notes (839,147)
Canada (511,218)
PEDS207 (22)
Jody Virr (22)

Sept 20 -Chapt 4 - Physical Growth and Aging.doc

7 Pages

Physical Education and Sport
Course Code
Jody Virr

This preview shows pages 1 and half of page 2. Sign up to view the full 7 pages of the document.
Chapt 4 – Physical Growth, Maturation, and Aging Lab activity 1.1 3,8,4,5,7,1,2,6 Rank from most advanced to least advanced Overview • Body growth and aging • Role of genes • Influence of extrinsic factors • Identify typical patterns of growth • Distinguish between growth and maturation Growth and Aging Change Individual Constraints • Genetic and extrinsic factors combine to influence growth and aging • We observe patterns in growth and aging • Universality: patterns that hold for all humans • Specificity: individual variation • Educators and therapists can make tasks developmentally appropriate Prenatal Development • Early development is controlled by genes • Normal development • inherited abnormal development • the embryo or fetus is sensitive to extrinsic factors • these extrinsic factors can have positive effect or negative effect • abnormal pressure, drugs, viruses, can harm the baby Embryonic Development • conception to 8 weeks • differentiation of cells to form specific tissue and organs • limbs formed at 4 weeks • human form noticeable at 8 weeks Implantation Fetal Development • 8 weeks to birth • Continued growth by hyperplasia (cell number) and hypertrophy (cell size) • Cephalocaudal (head to toe) and proximodistal (near to far) • Plasticity (capability of taking on a new function). The cells have the ability to develop in one direction but can change their direction of development very quickly • At birth, the bodily system should be working independently • If the baby is born early, lots of time, the baby will have lung deficiency, jaundice (liver problems) Fetal Nourishment • Oxygen and nutrients diffuse between fetal and maternal blood in placenta • Poor maternal health status can affect fetus • The lower of a socioeconomic status you are, the higer chances you have of having an underweight baby who dies in the first few weeks of birth Genetic Causes of Abnormal Development • Can be dominant disorders (defective gene from one parent) or recessive disorders (defective gene from each parent) • Can result from mutation of a gene • Effects on growth and maturation are variable • Children with down syndrome will have enlarged thumbs • They will be shorter than usual • They will have a cognitive impairment and they will only reach the mental age of 8 years old What are some genetic disabilities? What effects does each have on normal growth and development? Extrinsic Causes of Abnormal Development • Extrinsic factors can affect fetus through nourishment or physical environment • teratogens delivered through nourishment system act as malformation- producing agents • Some teratogenic effects result from too much of a substance, some from too little • Placenta screens some substances (ex. Large viruses) but not all harmful ones • Harmful environmental factors include pressure, temperature, X and gamma rays, oxygen-deficient atmospheres, pollutants • Tissues undergoing rapid development at time of exposure are most vulnerable • We cannot say a certain teratogen is responsible for a specific change or defect in a fet
More Less
Unlock Document

Only pages 1 and half of page 2 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.