Endoderm

and invertebrates are ectothermic, meaning their body heat is derived from the environment rather than metabolism. As a result of ectothermy, they have lower rates of metabolism compared to endotherms and are poorly insulated (Miller, 2010). Most endoderms are homeotherms whose body temperature is maintained relatively constant, and most ectoderms are poikilotherms whose internal temperature varies with its environment. There are many advantages and limitations of being endothermic or…

Comparing the Intrinsic Similarities and Characteristic Differences in Arthropods and Mollusks. Coastal regions possess a unique characteristics in which all plant and life forms have to adapt in order to be able to survive in such regions. One major characteristic of these regions is due to the constant wave motion of the seas in coastal regions. Hence, life forms such as Arthropods and Mollusks, predominant life forms present in these coastal regions, adapt and specialize to be able to thrive…

Compare and Contrast different Tissue types – M1 Comparison between Connective Tissue and Epithelial Tissue Similarities: There are many similarities between connective and epithelial tissues. One of which is that both the connective and epithelial tissues have at least 2 layers. A similarity between the connective and epithelial tissues related to the organelles present and its functions is that they both have nucleus and mitochondria, so both need the production of energy to function and…

Isaiah Juarez(current research) There are many different uses for stem cells, and different stem cells which can do things other stem cells can and can do. There are two main stem cells, and they the embryonic stem cells, and adult stem cells. However there ae about another dozen more stem cells which are also important to the human body. These other stem cells are tissue stem cells, blood stem cells, skin stem cells, Mesenchymal stem cells, stem cells in the eye, induced plum stem cells,…

This week in dynamics of human development we met with our groups for the remander of our class and did some group activities, watched the PBS film of Life’s Greatest Miracle, read Issue #2 in the Taking Sides book, and read chapter 3 in our Development of Children and Adolescents textbook. Issue #2 in Taking Sides was Does Maternal Employment Have Negative Effects on Children’s Development. Bascially it is stating that if a parent is in the workplace or at home, which side would end up in…

Introduction Fetal Alcohol Syndrome (FAS) is due to fetal alcohol exposure, and is the most serious case of the Fetal Alcohol Spectrum Disorders1. The embryonic development period between three and eight weeks are when the most birth defects occur, but pregnant women are advised not to consume alcohol during their entire pregnancy due to the adverse effects that alcohol can have on their child2. This paper will analyze the dangers of alcohol to a developing embryo or fetus, the manifestation…

Gastrulation “is a process in early development in which an embryo’s cells migrate to form three layers of tissue: the endoderm, the mesoderm, and the ectoderm” (Krogh, 2011, p. 620). The movement of cells during this phase will help to develop the embryo. After all movement has been completed, the cells will configure themselves into the three different layers. Each of these…

Ever since the 19th century, there have been many advances in the biological field of embryology. We can attribute a majority of these advances to Karl Ernst von Baer and his findings of the basic fundamentals of embryology. Raised in a family of military officials, von Baer decided to choose his own path in life and pursue the study of embryology (Oppenheimer). His many discoveries, including the mammalian ovum and the germ layer theory has allowed modern day scientists to further the…

During the fourth week of a pregnancy, the gut tube is formed from the endoderm that lines the yolk sac. The gut tube is divided into three regions: the foregut, the midgut, and the hindgut. The foregut differentiates into the trachea, pharynx, lungs, esophagus, stomach, liver, pancreas, upper duodenum, and the gallbladder.…

growing into any type of cell desired; these cells are called pluripotent. “Pluripotent stem cells are the primary choice for medical researchers seeking to develop therapies because these cells can develop into any of the three primary tissue types…[endoderm, mesoderm, ectoderm]” (Bellomo 35) The only place scientist can harvest these pluripotent cells is from the center of the blastocyst, which is the initial fertilization of the human egg. Without the presence of a womb, these cells do not…