The Physical Development OF A Human Being
The Physical Development of a Human Being As defined in Berk's, Development Through the Lifespan, physical development is changes in body size, proportions, appearance, and the functioning of various body systems; brain development; perceptual and motor capacities; and physical health. The physical development of a human being is the unique because of all of the visible changes that every human being goes through. Physical growth results from a continuous and complex interplay between heredity and environment. Humans begin to develop before they are out of their mother's womb. After conception, the zygote is what I consider the earliest development of the human being. The period of the zygote is about two weeks long. The zygote then becomes an embryo. The period of the embryo lasts from the second week on through the eighth week of pregnancy. The embryo then changes to form the fetus. The period of the fetus is from the ninth week until the end of the pregnancy. The zygote, embryo, and fetus all form in the first trimester or pregnancy. By the third trimester, the fetus is around seven and half pounds. I weighed about eight and one fourth pounds when I was born. My mother still tells me that whe
By fourteen, girls' breast growth is completed and at fourteen and a half, their pubic hair growth is completed. This is the time when vision and hearing really decline a noticeable amount. At the age of fourteen, they reach the peak of their height spurt, their facial hair begins to grow, and their voice begins to get deeper. During the second half of the first year, babies begin focusing on larger speech units. This helps babies to maintain a constant body temperature. For women it begins to decline especially after the age of thirty five, and for men it starts to decline after the age of forty. Massive sun exposure earlier in life tends to make the skin's wrinkling a faster process, and smoking seems to have a similar effect as well. From thirty to forty years of age, vision declines along with hearing and the skeletal system. After puberty, it seems like there are no more major physical changes that occur. Weight is gained steadily during this time. Some of the organs begin to decrease in function as well. This is mainly because the immune system is not yet fully developed s well as the constant exposure to sick children. Their spermarche occurs at thirteen. By nine months baby fat has usually arrived and is at its highest level. Babies do not tend to be very muscular or coordinated.
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