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pbis study guide KEY
pbis study guide KEY

... Complete this study guide to help prepare for the PBIS Assessment. You will also need to review all labs, handouts, and notes. Explain the difference between cells, tissues, organs and organ systems. Cells are the basic units of life. Tissues are a group of cells with the same structure and function ...
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... Your nervous system controls all these activities with electrical impulses. If any system in your body isn't working properly, other systems are affected. Think of your body as a building. A building has a plumbing system, a heating system, a cooling system, an electrical system, and a support syste ...
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... Countercurrent Exchange- when fluids or gases flow side by side in opposite directions; fish use this method to transfer oxygen from the surrounding water into their blood during respiration Concurrent Exchange- when fluids or gases flow side by side in the same direction Lungs- internal respiratory ...
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Division B Anatomy Practice Test

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O2 CO2 SKIT

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Human embryogenesis



Human embryogenesis is the process of cell division and cellular differentiation of the embryo that occurs during the early stages of development. In biological terms, human development entails growth from a one celled zygote to an adult human being. Fertilisation occurs when the sperm cell successfully enters and fuses with an egg cell (ovum). The genetic material of the sperm and egg then combine to form a single cell called a zygote and the germinal stage of prenatal development commences. Embryogenesis covers the first eight weeks of development and at the beginning of the ninth week the embryo is termed a fetus.Human embryology is the study of this development during the first eight weeks after fertilisation. The normal period of gestation (pregnancy) is nine months or 38 weeks.The germinal stage, refers to the time from fertilization, through the development of the early embryo until implantation is completed in the uterus. The germinal stage takes around 10 days.During this stage, the zygote, which is defined as an embryo because it contains a full complement of genetic material, begins to divide, in a process called cleavage. A blastocyst is then formed and implanted in the uterus. Embryogenesis continues with the next stage of gastrulation when the three germ layers of the embryo form in a process called histogenesis, and the processes of neurulation and organogenesis follow. The embryo is referred to as a fetus in the later stages of prenatal development, usually taken to be at the beginning of the ninth week. In comparison to the embryo, the fetus has more recognizable external features, and a more complete set of developing organs. The entire process of embryogenesis involves coordinated spatial and temporal changes in gene expression, cell growth and cellular differentiation. A nearly identical process occurs in other species, especially among chordates.
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