Tissue part 3
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This document discusses different types of epithelial tissues: 1. Pseudostratified epithelium has cells at variable heights but all rest on a basement membrane, with nuclei located at different levels and absent from the top 1/3 of cells. It is associated with cilia and goblet cells. 2. Transitional epithelium, like urothelium, can greatly stretch without losing integrity. Undistended it has 5-6 layers but distended has only 2-3 layers with surface cells becoming squamous. 3. Glandular epithelium can be unicellular or multicellular. Multicellular glands are classified by architecture, secretion mode, and secretion type. Architect
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Epithelial tissue lines body surfaces and forms glands. It has several key functions, including protection, absorption, and secretion. Epithelial cells are closely packed and polarized. They communicate through junctions and microstructures. There are several types of epithelia defined by their cell shape, number of layers, and location in the body. Epithelial tissues contain secretory cells that produce molecules for exocrine and endocrine glands.
Salivary glands
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Morphology of bacteria deepa babin
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Cell, the unit of life
Cell is the fundamental structural and functional unit of all living organisms. Unicellular organisms can live independently while multicellular organisms are made of many cells that work together. Cells come in various shapes and sizes depending on their function. Prokaryotic cells like bacteria are generally smaller and simpler than eukaryotic cells found in plants, animals and fungi. Both have a cell membrane but eukaryotic cells also have organelles like the nucleus, mitochondria and Golgi apparatus that are not present in prokaryotes.
Fundamental unit of life
Robert Hooke first discovered cells in 1665 while observing a thin slice of cork under his homemade microscope. He saw compartments resembling the structure of a honeycomb and coined the term "cell" to describe these structures. Later scientists like Leeuwenhoek, Brown, Purkinje, Schwann, Schleiden, and Virchow contributed to the development of the cell theory, which states that the cell is the fundamental unit of life, all living things are composed of cells, and new cells are produced from existing cells.
cell organelles new.pptx
This document provides information about the structure and functions of eukaryotic cells. It discusses the key organelles found in cells like the nucleus, endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes, mitochondria, and cytoskeleton. It explains their roles and comparative differences between prokaryotic and eukaryotic cells. Additionally, it covers the plasma membrane structure and fluid mosaic model. Finally, it summarizes different cell transport mechanisms including passive transport processes like diffusion, facilitated diffusion, and osmosis as well as active transport mechanisms like protein pumps, endocytosis, and exocytosis.
Marchantia .pptx
- Marchantia is a genus of liverworts that includes about 65 species. It grows in cool, moist, shady places and its thallus is dorsiventral and dichotomously branched.
- The life cycle of Marchantia involves alternation of generations between a dominant haploid gametophyte phase and a short diploid sporophyte phase. The gametophyte produces male and female sex organs that generate gametes via antherozoids and archegonia. Fertilization leads to a diploid zygote that develops into the sporophyte.
- The sporophyte is differentiated into a foot, seta, and capsule. Inside the
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histology_glands_5-2-15.pptx
The document summarizes the histology of salivary glands. It defines glands and their general features. It describes the different types of secretory units and classifications of glands based on location, number of cells/ducts, secretion type, and mode of secretion. Specific salivary glands like parotid, submandibular, and sublingual glands are discussed along with their serous and mucous acini. Minor salivary glands in the palate are also mentioned.
Cell Structure and Function by Dr. Zahoor Mir.pptx
Cell Anatomy and physiology ( structure and function for NEET asparients, Biology, MBBS, BPT, Allied, nursing , medical and paramedical students. This is the easiest form of slide share to understand the context better.
2.3 uniqueness
Cells are characterized by both uniformity and diversity in structure and function. While all cells share some basic components like a plasma membrane, DNA, and ribosomes, cells also show specialization. For example, flight muscle cells have many mitochondria for energy production during locomotion, while pancreatic cells secrete digestive enzymes. The document then predicts how cells would be affected without certain organelles, such as not being able to carry out protein synthesis without a nucleus, conduct aerobic respiration without mitochondria, or secrete enzymes without a Golgi apparatus.
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https://alandix.com/academic/papers/synergy2024-epistemic/
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Tissue part 3
- 1. Pseudo stratified • False stratified appearance • All cells resting on a basement membrane but not all of them reach the surface ( columnar & basal cell) • Nuclei are at variable level • No nuclei in the apical 1/3 of the cytoplasm • Associated with cilia & goblet cells
- 3. Transitional epithelium • Specialized epithelium • Urothelium • It can stretch greatly without losing its integrity • Undistended • Distended
- 4. UNDISTENDED L/M • 5 -6 LAYERS • BASAL LOW COLUMNAR CELLS • MIDDLE LAYER POLYHEDRAL & FLASK SHAPE CELLS • UPPER LAYER LARGE DOME SHAPE CELLS bulge into lumen dark pink line mono/binucleate indentations on under surface
- 6. Distended L/M • 2-3 layer • Basal low cuboidal • Surface cells approach a squamous form
- 7. CHARACTERISTICS • UNILAMINR • MITOTIC ACTIVITY • IMPERMEABLE • STRETCHING
- 8. ELECTRON MICROSCPE • All cells reach basal lamina through slender processes • Outer lipid layer Thick integral proteins – Plaques Uroplakin – Interplaque areas hinges • Concentration of microfilament – Internalization of membrane vesicle • Desmosomes between adjacent cells
- 9. CHARACTERISTICS • UNILAMINR MITOTIC ACTIVITY – All cells reach basal lamina through slender processes • IMPERMEABLE – Thicker outer layer of cell membrane – desmosomes • Ability to change surface area – Mucosal folding – Dome cells
- 11. GLANDULAR EPITHELIUM • UNICELLULAR • MULTICELLULAR ENDOCRINE aggregated cells form anastomosing cordswith interspersed capillaries EXOCRINE Architectural classification mode of secretion Type of secretion
- 13. Architectural
- 14. • Simple tubular straight large intestine coiled----sweat glands branched---cardiac end of stomach alveolar straight----urethra branched-----pyloric part of stomach • Compound tubular-----Brunner gland alveolar----excretory part tubuloalveolar---submandibular
- 15. MODE OF SECRETION • APOCRINE apical part of cell is lost with secretion modified sweat gland • MEROCRINE no part of cytoplasm is lost e.g. sweat gland • HOLOCRINE whole of the cell is lost e.g. sebaceous gland
- 17. TYPE OF SECRETION SEROUS & MUCOUS • Bluish purple • Pink • Nucleus round basal • Flat perpiheral • Cell out line not clear • Lumen indistinct • Clear • Basal basophilia • Distinct • No basal basophilia