20
Oct
The respiratory system does not carry out its physiological function of gas exchange until after birth. MALAT-1 may be involved in the development of zebrafish brain and heart.
And the endoderm which forms the digestive system lungs and urinary system.
Function of the embryo. In lower animals the embryo is nourished by the yolk. By the process of gastrulation the embryo differentiates into three types of tissue. The ectoderm producing the skin and nervous system.
The mesoderm from which develop connective tissues the circulatory system muscles and bones. And the endoderm which forms the digestive system lungs and urinary system. When the placenta takes over nourishing the embryo at approximately week 4 the yolk sac has been greatly reduced in size and its main function is to serve as the source of blood cells and germ cells cells that will give rise to gametes.
The embryonic stage is a critical period of development. Events that occur in the embryo lay the foundation for virtually all of the bodys different cells tissues organs and organ systems. Genetic defects or harmful environmental exposures during this stage are likely to have devastating effects on the developing organism.
The role of mitochondrial function in the oocyte and embryo Mitochondria have long been known to be the powerhouses of the cell but they also contribute to redox and Ca2 homeostasis provide intermediary metabolites and store proapoptotic factors. The growth of many plants begin with the seed embryo the part of the seed containing the early forms of the plants leaves stems and roots. The embryo functions as a sort of life starter kit for the plant.
When conditions are right for the seed to grow the embryo activates and growth begins. During embryonic development of multicellular organisms there is a continuous cycle of cell proliferation differentiation and death that permits tissue remodeling and organogenesis. As cells die they are recognized and engulfed by specialized phagocytes.
Polar nucleus after the fertilization develops into a endosperm which helps the embryo in nourishment. It is nutritive in function. It is functional only after the fertilization.
In the context of an embryo an organizer refers to a group of cells that harbour the ability to instruct fates and morphogenesis in surrounding cells steering their development into specific organs and tissues Anderson et al 2016. As a result organizers can position specific. The respiratory system does not carry out its physiological function of gas exchange until after birth.
The respiratory tract diaphragm and lungs do form early in embryonic development. The respiratory tract is divided anatomically into 2 main parts. It serves as a source of midline signals that pattern surrounding tissues and as a major skeletal element of the developing embryo.
Genetic and embryological studies over the past decade have informed us about the development and function of the notochord. This historic 1920 paper describes human liver function during development. The Latin translation of the quotation is from Google.
John Ernest Frazer 1870-1946 also wrote on several other embryology topics as well as published an embryology textbook. Our current understanding on liver development and function is far more detailed. Also by this author.
MALAT-1 is mainly expressed in the embryonic nervous system. MALAT-1 highly expressed in the brain eyes and heart of zebrafish. MALAT-1 expression is integrant for zebrafish embryonic development.
MALAT-1 may be involved in the development of zebrafish brain and heart. While they have been intensely studied as major epigenetic regulators little is known about their physiological roles and the extent of functional redundancy following embryo implantation. Here we define non-redundant roles for TET1 at an early postimplantation stage of the mouse embryo when its paralogs Tet2 and Tet3 are not detectably expressed.