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Chapter 21 The Lymphatic System
Chapter 21 The Lymphatic System

... – The sinusoids drain into a central longitudinal vein that exit the bone – Reticular cells; location? (1) induce formation of WBCs; (2) aging reticular cells become adipose cells ...
Animal phylogeny in the light of the trochaea theory
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... probably gastraeozoan characteristics indicating a higher level of coordination between the cells (Mackie & Singla, 1983). The choanocytelike cells found in many gastraeozoans (see, for example, Rieger, 1976) have shorter pseudopodia than choanoflagellates and sponge choanocytes and lack the ciliary ...
Early Embryonic Mesoderm Development
Early Embryonic Mesoderm Development

... The extraembryonic mesoderm remains closely associated with both the ectoderm and endoderm layers in the extraembryonic region, but in so doing it splits into two layers, the somatic and splanchnic layers, by the formation of a cavity between them known as the extraembryonic coelom or exocoelom. Com ...
Cell Biology - Educational Services
Cell Biology - Educational Services

... Any form of reproduction of this book in any format or medium, in whole or in sections must include the referral attribution link http://www.ck12.org/saythanks (placed in a visible location) in addition to the following terms. Except as otherwise noted, all CK-12 Content (including CK-12 Curriculum ...
The Tissue Level of Organization
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... Holocrine. Holocrine secretion occurs as superficial gland cells burst. Continued secretion involves the replacement of these cells through the mitotic division of underlying stem cells. © 2013 Pearson Education, Inc. ...
Chapter 4 Lecture
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... Holocrine. Holocrine secretion occurs as superficial gland cells burst. Continued secretion involves the replacement of these cells through the mitotic division of underlying stem cells. © 2013 Pearson Education, Inc. ...
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... Holocrine. Holocrine secretion occurs as superficial gland cells burst. Continued secretion involves the replacement of these cells through the mitotic division of underlying stem cells. © 2013 Pearson Education, Inc. ...
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chapter 4 lecture with my notes
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biology final
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... as the external auditory meatus and canal. The first pharyngeal pouch (choice C) gives rise to the tympanic cavity and auditory tube. • The second pharyngeal arch (choice D), like the first, gives rise to bones, muscles and ligaments: the stapes and lesser horn and upper part of the body of the hyoi ...
Cell Division – Revision Pack (B3)
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... When a cell in ‘undifferentiated’, it can develop into different cells, tissues and organs; stem cells are an example of an ‘undifferentiated’ cell. Stem cells can be obtained from embryos and could be potentially used to treat many medical conditions including Parkinson’s disease and paralysis. Man ...
Histology and Embryology Self Test Book
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Embryonic vascular development: immunohistochemical
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... al. 1987) monoclonal antibodies fill this need as they label vascular endothelial cells and cells of the haematopoietic lineage in embryos of the Japanese quail. The sprouting form of angiogenesis has been much more extensively studied recently as it is the mechanism by which tumours recruit a new v ...
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... liberation of the oocyte. It is stimulated by LH hormones released from the anterior pituitary gland in response to high amounts of circulating estrogen. Blood increase to the site as well as local release of histamine, prostaglandins, vasopressin and collagenase. Granular cells become loose and fol ...
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... 7. state that all gametes contain half the number of chromosomes as body cells. This is called the haploid number. 8. describe the process of fertilisation in mammals. 9. describe the process of pollination and fertilisation in plants. 10. state how the diploid number is restored at fertilisation. 1 ...
Anatomy of paranasal sinuses
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...  Made up of complex bony labyrinth of thin walled cells.  A few ethmoid cells may be present at birth.  At birth it is filled with fluid. ...
Biology Class IX for SA-I 2016-17
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... Answer: Cells were discovered in 1665 by an English Botanist, Robert Hooke. He used a primitive microscope to observe cells in a cork slice. Q2. Why is the cell called the structural and functional unit of life? Answer: Cells constitute various components of plants and animals. A cell is the smalles ...
The Umbilical Cord and Body- stalk. The umbilical cord (Fig. 28
The Umbilical Cord and Body- stalk. The umbilical cord (Fig. 28

... glands are only slightly expanded, and are lined by columnar cells; • (2) stratum spongiosum, in which the gland tubes are greatly dilated and very tortuous, and are ultimately separated from one another by only a small amount of interglandular tissue, while their lining cells are flattened or cubic ...
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Embryonic stem cell



Embryonic stem cells (ES cells) are pluripotent stem cells derived from the inner cell mass of a blastocyst, an early-stage preimplantation embryo. Human embryos reach the blastocyst stage 4–5 days post fertilization, at which time they consist of 50–150 cells. Isolating the embryoblast or inner cell mass (ICM) results in destruction of the blastocyst, which raises ethical issues, including whether or not embryos at the pre-implantation stage should be considered to have the same moral or legal status as more developed human beings.Human ES cells measure approximately 14 μm while mouse ES cells are closer to 8 μm.
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