Few people think about the fact that each stage of life has its own name.So, science knows and postembryonic embryonic development.These times are very different from each other and have different characteristics.The article focuses on what is called the post-embryonic development.You will find types of the period and features.
What is called the post-embryonic development?
The moment when the embryo leaves the fetal membranes, is a transition from the embryonic period in postembryonic.In people, this time called birth.It is worth noting that different organisms, this process is very different.
Types of living organism
post-embryonic period can be characterized by two types of development.Science knows the direct and indirect conversion of a living organism.
refers to this type of transformation of the body, which is very similar to an adult.For postembryonic human development has a direct view.This may also include the development of animals and some reptiles.
After the birth of the embryo is very similar to the adult organism.However, it differs in size and lack of skill.
Indirect development or metamorphosis
post-embryonic period can have an indirect form (metamorphosis).In this case the membranes appears the body, which is very different from an adult.This could include some invertebrates, mollusks and reptiles.As an example, take an ordinary butterfly.Post-embryonic development of an organism, in this case is characterized by being in the form of larvae.Only after this butterfly becomes similar to adult.
Characteristics of post-embryonic period (direct development)
As mentioned above, as soon as a new body leaves the fetal membranes, a new stage in development.Postembryonic human development is divided into several stages.The final stage is puberty.Consider the basic steps post-embryonic period.
first stage of development, from birth to six months
At this stage the baby is adjusting to the new environment.He learns to listen and focus your eyes on certain things.Meals at this stage of development of extremely liquid.Kid still can not independently eat adult food, and depends entirely on the mother.Some children are quicker to develop than others.They go to the next level of post-embryonic period faster.For example, some kids have six months can stand, sit and crawl.However, this is only the physical skills.Science is not known yet when the child at this stage began to speak the language understandable to an adult.
It is worth noting that many animals and reptiles, which are a direct way post-embryonic development, living about the same.However, they may extend this period is much faster than in man.
second stage of development: up to one year
At this stage, the little man is learning to sit crawl and walk.This stage is characterized by the acquisition of physical skills.Also, young body gradually get used to the new food.Many kids at this stage begin to issue new sounds.So they learn to speak the language understood by an adult.If a child develops faster at this stage it can already speak some words or even simple sentences.
reptiles and animals in this period is already fully prepared for adult life.They can produce their own food and are no longer dependent on adults.
Third Period: growth and training
human body is characterized by the longest post-embryonic development.At this stage the child already may serve itself, but to live without parents it is still very difficult.In ordinary life, the children at this level attend pre-school, and then the schools.They grow, develop, and teaches all that is useful to them in their adult life.
mammals and animals at this stage already completed the postembryonic period and are considered by adults.
fourth period: puberty
So, what is called the post-embryonic development, you already know.In humans, it ends in about 16-20 years.At this stage begin to work the important parts of the body.Pituitary and adrenal glands produce certain hormones.In women, the ovaries begin to function and menstruation occurs.Men become sexually mature and able to continue his race.
Ends postembryonic period of transition into adulthood.Man already able to live independently and create their own family.
Feature indirect post-embryonic development
As in the previous case, this development is divided into several stages.Let us examine them in detail.
First step: after the birth of
Immediately after the body leaves the fetal membranes, begins its further transformation.At this stage, the new individual is completely different from the adult.It is very different appearance and internal development.
The second stage: the transformation
At this stage there is a strong conversion of the new body.Each kind of living being, it proceeds differently.An individual becomes similar to an adult animal or a mammal.However, many organisms are at this stage still in need of care and protection.They can not yet provide for themselves.
Third stage: acquisition of skills
Indirect postembryonic development is the final stage, which is characterized by the acquisition of certain skills.They will help the future of the body to live on their own and not depend on foreign individuals.
Summary and Conclusion
Now you know what is called the post-embryonic development.It is worth noting that the indirect conversion is significantly faster than direct postembryonic period.
man undergoes the longest during this phase.However, human skills can survive even in the most difficult conditions.This is not the reptiles or animals.For human development in the post-embryonic period of the next few doctors: pediatrician, neurologist and others.Also especially closely watched kid's parents.
Everyone should know what postembryonic period.Initial data about that time already known from biology lessons.Such information helps to develop their own world.