human life span development

Topics: Old age, Jean Piaget, Infant Pages: 9 (5243 words) Published: June 26, 2014
Growth refers to an increase in size, such as changes in an individual’s body for example size, weight, height and shape. Development usually comes in stages, as in the changes in the complexity of an individual and a rise in skills or knowledge, such as learning how to walk.

Conception to birth (0-9 months)
P1) The internal development is the development of the embryo in the mothers body which is needed to absorb oxygen and food from the blood for the baby. At this stage all of the developments are physical changes.

M1) Physically about two weeks after a woman’s menstrual period the ovary releases an egg, which then travels down the fallopian tube. Sperm travels through the cervix and swims into the fallopian tube - one single egg penetrates the egg cell and the resulting cell is called a zygote, then the fertilised egg travels down the fallopian tube. While doing this the fertilized egg divides once it has travelled through the fallopian tube, the embryo implants into the womb lining. From four weeks the embryo now relaxes in the womb lining, the outer cell reach out like roots to come together to the mothers blood supply. The inner layer of cells form into two then later on shape into three, each one of these layers will grow to be different parts of the baby’s body. One of the layers becomes the brain and nervous system, the eyes, skin and ears. Another layer will form into the lungs, gut and stomach; finally the third layer will grow into the blood, muscles, heart and bones. The fifth week is the time of the first missed period when many women are only just beginning to think they may be pregnant. Nevertheless already the baby’s nervous system is starting to develop. A groove forms into the top layer of cells. The cells fold up around to make a hollow tube called the neural tube. This will form into the baby’s brain and spinal cord. At the same time the baby’s heart is coming together and already has some of its own blood vessels. A string of these will link baby and mother and will become the umbilical cord. From week six to seven there is now an outsized bulge where the heart is and a bump for the head because the brain is developing. The heart begins to beat and can be seen beating on an ultrasound scan. Dimples will appear on the side of the head which will become the ears and there are thickenings where the eyes will form. On the baby’s body there will become bumps where the muscles and bones will be forming. At seven weeks the embryo has grown to 10mm long from head to bottom, this measurement is called “crown- rump length”. By week eight a face is gradually forming, the eyes are more recognizable and have some colour in them. Also there is a mouth in which the tongue has formed. There are now the beginnings of hands and feet, with ridges where the fingers and toes will be. The major internal organs are all developing which are the, brain, heart, kidneys, lungs, gut and the liver. On week nine the baby has grown to about 22mm long from head to bottom. Week ten to fourteen, just 12 weeks after conception the fetus is fully formed. Its development all their organs, muscles, bones, limbs, and its sex organs, from now on it has grown and matured. The baby is now able to move about; however, the movement’s cannot yet be felt. By fourteen weeks the heart beat is well-built and can be heard through using an ultrasound detector. The baby’s heart beat is extremely fast, about twice as fast as a normal adult’s heartbeat. At fourteen weeks the baby is about 85mm long from head to bottom. From week fifteen the baby has now growth swiftly, the body grows bigger so that the head and body are more in proportion and the baby doesn’t look so top heavy. The face looks much more human and the hair is beginning to grow as well as eyebrows and eyelashes. However the eye lids stay closed over the eyes. The lids of the skin of the fingers are now made, so now the baby has its own individual fingerprint....

Bibliography: Class notes
Text book health and social care Level 2 Btec first : Elizabeth Haworth: Unit 8 published by Pearson Education Limited 2010
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