This website uses cookies to ensure you have the best experience. Learn more

Embryonic Development In The Lungs Essay

2195 words - 9 pages

In this essay I am going to talk about the lungs and the stages of their embryonic development. I chose the lungs because they are one of the most important organs for survival -they supply oxygen to cells and release carbon dioxide to the atmosphere. This essay will mostly focus on the different stages of the lung development- the embryonic, the pseudoglandular, the canalicular, the terminal sac, and the postnatal stage.

The successful maturation of the lungs requires the completion of both biochemical and physical processes. The physical one is required for the structure and the biochemical one is required for maintaining such large surface area (surfactant). These two requirements are greatly related and the incomplete development of any of these processes will lead to insufficiency and compromise of the newborn. In the picture below you can see the all the stages summarized:

We know that the human lung starts as a primitive lung bud in the early fetal life and then undergoes many different morphological processes that also continue in the postnatal life. Genetic, hormonal, physical, and environmental factors, as tightly regulated events, together with lung liquid, and fetal breathing movements form a complex that contributes to each stage. The 5 stages of structural lung development occur at progressive times during gestation. The timing of the phases is not exact set since we have disparity between fetuses.
First is the Embryonic Stage (Weeks 4 to 7). This embryonic stage includes the initial formation of the respiratory diverticulum up to the formation of the all the key bronchopulmonary segments. The lung develops as an outgrowth of the ventral wall of the primitive foregut the laryngotracheal groove. Foregut’s endodermic epithelial cells invade the mesenchyme forming the trachea which then branches to the left and right bronchi (main) and afterward into the lobar and segmental ones. Lobar and segmental ones appear about the fifth week. The foregut is divided between the trachea and the esophagus by the esophagealtracheal septum. Here it Is important to mention that the formation of the trachea and the lung buds are independent events (according to experiments FGD 10 null mice develop a trachea but no buds of lungs. The veins together with the pulmonary arteries grow as a lone non-vascular bud from the sixth aortic arch and go one with grow by vasculogenesis in the region of the airways buds. Close to the end of the embryonic phase mesenchymal cells begin to hollow the early formed trachea and starts differentiate into cartilage precursor. However the cartilage formation keeps until the end of the canalicular stage where is also completed around even the smallest bronchi.
The same time lung buds expand in a caudolateral direction into a fluid filled body cavity between the intestines and the body wall of some higher metazoans (lined with mesodermal epithelium). Each pericardioperitoneal canal will be progressively...

Find Another Essay On Embryonic Development in the Lungs

The Role of Immaturity in Human Development

581 words - 3 pages onset of puberty when compared to other species. The elongated period of low fertility, which extends the nonreproductive years, enables the individual to maintain their juvenile characteristics and continues to grow their cognition and social skills before producing offspring, ensuring that they are better suited to aid in the development of their own offspring’s development (Bjorklund & Pellegrini, 2002). Social gains have also been prevalent as

Afghanistan in the Way of Development

743 words - 3 pages . Afghanistan is today one of the poorest country in the world. In 1930 Afghanistan started development program with a low economy. The government founded banks and introduced paper money. The government established universities and schools and send student abroad for studies. When Soviet Union occupied Afghanistan, They destroyed the cities. They used so dangerous weapons and killed so many people. More than four million of people migrated to

Afghanistan in the Way of Development

1143 words - 5 pages . Afghanistan is today one of the poorest country in the world. In 1930 Afghanistan started development program with a low economy. The government founded banks and introduced paper money. The government established universities and schools and send student abroad for studies. When Soviet Union occupied Afghanistan, They destroyed the cities. They used so dangerous weapons and killed so many people. More than four million of people migrated to

Development Psychology: Child in the Preoperational Stage

2270 words - 9 pages performed consistently poorly across all three standard Piagetian tasks. As a result, the child's performance in the tests clearly places her in Piaget's preoperational stage of development. The results are consistent with all critics in the current field, who found children of preoperational stage to perform poorly across standard tasks (Light, 1986, Siegel, 1978, 2003, Meadows, 1988). Hence, the validity of the criticisms relies on the child's

steps in the multimedia project development

695 words - 3 pages finished in an ordered sequence before other phases can begin while some phases may be merged or skipped. The overall multimedia project must be well done in an organized manner to ensure that the development runs smoothly according to the time constraint and dateline without excess the estimated budget. There are four major phases which are involved in the production of a multimedia project (Bangia, 2005; Coorough & Shuman, 2005; & Vaughan

The Development Of Christianity In America

1551 words - 6 pages than merely pagan-Christian dynamics; the Christians were greatly divided, and Christian efforts went through many ebbs before becoming firmly established. One must evaluate the development of both Rome and England to gain an adequate understanding of early English Christianity. Fifty-five years before the birth of Jesus Christ, Julius Caesar encountered the Druidic religious culture in his invasion of Britain. Although only recently

The Development of Trade Unions in Britain

1580 words - 6 pages The Development of Trade Unions in Britain There are many different factors as to why trade unions developed so incredibly slowly in Britain. The problems started from the 1850s when New Model Unions were introduced. The ASE (Amalgamated Society of Engineers) had been formed in 1851 and had become the inspiration for other unions in similar areas of craftsmanship to be formed. Many people liked the idea of a union

The Development of Anabolic Steroids in Sports

3613 words - 14 pages . McGinnis. "Androgenic anabolic steroid exposure during adolescence: Ramifications for brain development and behavior." Hormones and Behavior 64.2 (2013): 350+. Academic OneFile. Web. 11 Mar. 2014. 1. The argument is that adolescent drug use will lead to changes in brain chemistry due to testosterone and other chemicals in synthetic hormones. It leads to increased aggression the researches marked the acts as enbolderment because they are motivated and

The Development of the Artist in Woolf’s To the Lighthouse

2031 words - 8 pages Virginia Woolf’s To the Lighthouse has been described as a Künstlerroman or artist novel. It traces the development of an artist, much like the Bildungsroman traced the development of a child into adulthood (Daughtery 148). The main artist of the novel is Lily Briscoe. As the novel progresses, Lily comes to terms with art and with life. To the Lighthouse is, in many ways, a quest novel (Daughter 148). This is evidenced by the title, which

Position of Livestock in the Socio-economic Development in Pakistan

978 words - 4 pages Livestock Sector occupies a unique position in the socio-economic development of Pakistan. Its contribution in the agriculture is 55.4 percent and 11.9 percent in the national GDP.About 35-40 percent of income of more than 35 million rural populations comes from livestock production activities.Eight percent of total exports derived from livestock and livestock products. According to Economic Survey of Pakistan 2013-14,approximately 64.4 Million

The Need for Development in the African Continent

1684 words - 7 pages Why Is There a Need for Development In Africa? Since the dawn of the colonial era, the African continent has experienced numerous hardships on the pathway to economic and human development. High levels of poverty, disease, and inequality coupled with low levels of human development, education, and infrastructure has long gripped the continent and has stifled growth efforts (Gorton). An example of this extreme poverty lies in the African

Similar Essays

Controversy In The Use Of Embryonic Stem Cells

1448 words - 6 pages next generation as mere raw material for satisfying the needs of our own.” (“Miracle Cell”). It is very discomforting how much power politics can have over logical, scientific development. While paralyzed people are suffering with no improvement, once paralyzed mice are walking again. Overall, I support the use of embryonic stem cells in science. The embryonic stem cell has such great potential and it should not be put to waste. New and

The State's Role In The Development Process

1224 words - 5 pages What should be the state's role in the development process? Why has there been a neoliberal backlash against government involvement in development? In theory, the role of the state in development should be a small one. Instead of following outmoded socialist central planning policies akin to those of the Eastern bloc in the twentieth century, poor countries should emulate the West and open up its markets to international trade; encourage the

Social Development In The Global South

2153 words - 9 pages Introduction Determinants of social development in the developing world are unclear just as the ones facilitating economic development and industrialization. The subject has remained a controversial one for a while, at least among academics, and might remain that way for years to come. From McGuire to Haggard and Kaufman to Huber and Stephens, different theories have been put forward to explain the origin or causes of social entitlements in the

The Development Theory In East Asia

1825 words - 8 pages proposes an alternative which is a representative democracy based on development theory. Development theory is collection of ideas about how desirable change in society is best achieved. He argues of the multiple failures of both liberal and social democracies. Both systems are based on delegation as a means of creating and directing national policies. The voter selects a delegate and that delegate through a top to down approach creates laws and