Define each of the following terms. Be clear whether it is at develop.pdf
- 1. Define each of the following terms. Be clear whether it is at developmental STAGE, PROCESS, or STRUCTURE. Then, place a check to indicate in which of the organisms the term can be found Solution CLEAVAGE:The process by which zygote rapidly divides without growing to become multicellular. the cleavage is a process,it occurs in birds,reptiles, it occurs in human zygote etc. MORULA:morula is an early stage of embryo contain cells of blastomeres in a solid ball with in the zonna pellucida it is a developmental stage,it forms in.human zygote after cleavage. BLASTULA:blastula is a hollow sphere of cells surrounding by an inner fluid filled cavity called blastocoele.,it is an embryonic development stage.it occurs in embryonic development in animals. GASTRULA:During gastrula single layered blastula is reorganised in to trilamminar structure known as gastrula.it occurs in early phase in embryonic development stage.it occurs in most of animals. NEURALA: It is relating to the Nervous system.it is a folding process in vertebrate embryos.it gives rise to both the spinal cord and the brain. Archenteron: It is the rudimentary alimentary cavity of an embryo at the gastrula stage.The primary gut that forms during gastrulation in the developing zygote is known as the archenteron or the digestive tube. Blastocoel: Blastocoel is termed as blastocyst cavity.It is a fluid filled cavity that forms in the animal hemisphere of early amphibian and echinoderm embryos.It have two major functions in frog embryos: (1) it permits cell migration during gastrulation, and (2) it prevents the cells beneath it from interacting prematurely with the cells above it. Blastomere: It is a cell formed by cleavage of a fertilized ovum.Cells in cleavage stage embryo are known as blastomeres. Embryo divides without growth ,It undergoes cleavage divisions that produce separate cells called Blastomeres. Blastopore: opening of the archenteron in the gastrula that develops into the mouth in protostomes and the anus in deuterostomes.It is the opening into the archenteron during the embryonic stages of an organism. Brain: Human brain is the organ of central nervous system.Located in the head protected by the skull.The brain is the most complex organ in a vertebrate's body. Ectoderm: The outermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the epidermis, nerve tissue, and nephridia. Endoderm: The innermost layer of the germ layer which includes the linings of the digestive and
- 2. respiratory tracts, parts of the urinary system, the liver, the pancreas, the gallbladder, the thyroid gland, the parathyroid glands, and the thymus.