Primary Tissues

Descrição

Formation of primary tissues. Tissues types
Riki M
FlashCards por Riki M, atualizado more than 1 year ago
Riki M
Criado por Riki M quase 9 anos atrás
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Resumo de Recurso

Questão Responda
What are the three stages of cell formation? > Cleavage > Formation of Blastula > Development of 3 germ layers (gastrulation)
What occurs in the cleavage stage? > a rapid division of zygote into small cells > Formation of blastomeres > Embryo is divided in 2 = Animal pole (ectoderm) and vegetal pole (endoderm)
What is a gastrula? A blastula which consists of a hallow blastocyst cavity and contains 32 cells in total.
What process is important to development? Differentiation and specialization of cells
What are the three germ layers? > Endoderm > Mesoderm > Ectoderm
What does each germ layer form? > Endoderm forms from the vegetal pole and creates internal tissues (pancreas, liver, lining of stomach) > Mesoderm only forms if endo & ecto are touching. creates heart, circulatory system, skeleton. > Ectoderm - forms from animal pole, create external tissues (hair, nails)
What are the important inductive signals and what do they create?
What are the 4 types of stem cells? > Totipotent - can give rise to any tissue. > Pluripotent - cannot make placenta, only adult cells. > Multipotent - only limited No. cells. > Unipotent - only makes one cell type.
What is Organogenesis? > Formation of organs in their proper locations. Occurs between germ layers.
What is Morphogenesis? Where growth is regulated. For example cell growth and shape.
What is meant by 'polar epithelial cells'? Cell has a apical surface and a basal surface which determines polarity. Basal surface acts as scaffolding while apical is the top surface, may contain mircovilli etc.
What is the first level of epithelial classification? Simple cells which are flat, one layer. Can be divided into sqaumous, cuboidal and columnar cells.
What is the second level of epithelial classification? Stratified, stacked cells. Can be divided into sqaumous, cuboidal and columnar cells.
What are the 4 types of connective tissue? > Connective tissue proper > Cartilage > Bone tissue > blood
What are the 3 types of muscle tissue? > Skeletal (ligaments) > Cardiac (heart) > Smooth (stomach)
What are the 3 lining membranes? > Cutaneous (skin -kerantinized) > Mucus (respiratory) > Serous (surrounds organs)
What are Glandular cells? Cells which secrete substances and are either exocrine or endocrine
What are the 3 modes of secretion? > Merocrine - exocytosis > Apocrine - releases vesicles > Holocrine - cell bursts

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