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How Are Cells Differentiated
How Are Cells Differentiated

... • Compare eukaryotic and prokaryotic cells using a graphic organizer. • Compare plant and animal cells using a graphic organizer. • From the estimated cell size, have the student measure their height and width to determine how many cells it would take to make a body their size. Show calculations. • ...
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Unit 4 Exam Review
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... a. __________________________ Neuron - Many dendrites converge into one main dendrite; one axon, found in retina, inner ear, olfactory cells b. __________________________ Neuron - Many dendrites; no axon, found in the brain and retina c. __________________________ Neuron - Many dendrites lead direct ...
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HS-Anatomy - Partners4results

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Lesson 34 - Zoology, UBC
Lesson 34 - Zoology, UBC

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Structural Organization In Animals
Structural Organization In Animals

... functions as a lining for body cavities, ducts, and tubes. (b) Compound Epithelium. The compound epithelium consists of two or more cell layers and has protective function as it does in our skin. They cover the dry surface of the skin, the moist surface of buccal cavity, pharynx, inner lining of duc ...
Chapter 30 Power Point
Chapter 30 Power Point

... • Some of the ways in which invertebrates care for their offspring may seem horrifying to humans • For example, the eggs of some species of mites hatch within the female’s body • The larvae immediately begin to devour their mother from the inside! • Within two days – while still inside their mother’ ...
Universal indicator
Universal indicator

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The Eye File
The Eye File

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Intro to Animals Scavenger Hunt
Intro to Animals Scavenger Hunt

... B. anus In all deuterostome embryos, the blastopore will become the ___________________. (pgs 114-115) A. mouth B. anus ...
< 1 ... 69 70 71 72 73 74 75 76 77 ... 165 >

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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