There are three kinds of stem cells that are classified according to how versatile they are in their development. Totipotent stem cells are the most versatile type‚ these can divide into cells that will generate all the cells that will make up the embryo; these totipotent cells are about three days old. Pluripotent stem cells give rise to all tissue types but cannot develop into the entire organism; these are pluripotent on the fourth day. Unipotent stem cells are the adult precursor cells that may
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human body originate. And why are some people saying that it is not morally right? Most arguments on the topic of trem cell research are that to obtain stem cells‚ a scientist or embryologist must extract the cells from a human embryo. After the cells are extracted‚ the embryo is unable to grow and ultimately dies. Some scientists that work for the American Association for the Advancement of Science believe that stem cell research can co-exist with the Supreme Court’s 1973 legalization of abortion.
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x-rays)‚ chemicals (for example‚ drugs‚ cigarettes‚ or alcohol)‚ and infections in the mother (for example‚ herpes or rubella). Some teratogens are also mutagens because they do their damage by changing the genetic code in cells of the developing embryo. Nutritional deficiencies during pregnancy also can lead to birth defects. As Figure 21-7 shows‚ the period during the first trimester when the tissues are beginning to differentiate and the organs are just starting to develop is the time that
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being or animal. There is a plethora of controversy about when life truly starts. Does it start right when the sperm meets the egg? Does it start when the fetus develops enough to feel? Most have their own opinion on this topic‚ but if “killing” an embryo can save lives it might be worth it. General stem cell research has been going on for many years‚ but due to cut funding‚ advancements have been inhibited. It was cut because embryonic stem cells research is considered unethical‚ but embryonic stem
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Jennifer Lucas English 111 61L April 10‚ 2011 Final Draft Physical Restraints in Heath Care facilities Restraints are usually used for the protection of patients and others when medication and verbal therapies are insufficient to control potentially violet patients. Questions are still left unanswered about how the restraints are used. What are the protocols on restraints? Are the staff members trained in using these kinds of restraints? How long should a patient be placed in these restraints
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CISSP Exam Notes - Physical Security 1 CISSP Exam Notes - Physical Security 1. Introduction 1.1 Physical security addresses the physical protection of the resources of an organization‚ which include people‚ data‚ facilities‚ equipment‚ systems‚ etc. It concerns with people safety‚ how people can physically enter an environment and how the environmental issues affect equipment and systems. People safety always takes precedence over the other security factors. 1.2 Physical security is the
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I first had physical therapy at 27‚ after I slipped on an icy Montreal sidewalk and tore the ligaments in my left ankle. I had it again at 42 and 43‚ after surgery on my right and left knees‚ and most recently I’ve had it on both shoulders. My orthopedist likes to say surgery is half the battle. If so‚ it’s the easy half. The slow and repetitive work of physical therapy often starts the next day‚ and for an injury like a tear in an anterior cruciate ligament‚ it can take up to six months. Before
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bstract: Embryonic stem cell research involves the destruction of an embryo after stem cells are extracted. The ethical considerations of destroying an embryo results in a controversy where proponents of the research are pitted against pro life supporters who see the destruction of the embryo as immoral. This paper addresses the objections to embryonic stem cell research‚ similar to those against abortion‚ which are rooted in the belief that it is morally impermissible to intentionally take the life
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begins. Implantation – embryo attaches itself to the thickened lining of the uterus. Cleavage – When the cell divides rapidly after the egg is fertilized. Blastocyst – developing of the embryo and forming in outer and inner layer. Placenta- When the blood vessels reach organ that is present only during pregnancy. Gastrula – when cell begins to specialize to form an embryo the structure of the developing embryo. The yolk sac is supplying the nutrients to the embryo for about the first two months
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EMBRYOLOGY WHAT IS EMBRYOLOGY? The study of embryo and fetus is called embryology. WHAT IS THE SIGNIFICANCE OF EMBRYOLOGY? It tells us how life begins and what are events of development in the intrauterine life. INTIAL STAGES OF EMBRYOLOGY BEFORE DEVELOPMENT Gonades Ovary in female Testis in Male Oogenensis Spermatogenesis Ovum (Haploid)
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