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Questions and Answers
What is the primary function of compound epithelium?
Which type of junction allows the rapid transfer of ions and small molecules between adjoining cells?
Which glands secrete hormones directly into the fluid bathing the gland?
Which of the following is a characteristic of connective tissue?
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What type of cells form glands that secrete through ducts or tubes?
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What is the role of adhering junctions in epithelial tissue?
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Where can compound epithelium be typically found?
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What type of epithelial cells is composed of isolated glandular cells?
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Which type of gland would most likely be responsible for secreting saliva?
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Study Notes
Glandular Epithelium
- Glandular epithelium can be classified into two types: unicellular and multicellular.
- Unicellular glands consist of isolated glandular cells, such as goblet cells in the alimentary canal.
- Multicellular glands consist of a cluster of cells, such as the salivary gland.
Gland Classification
- Glands can be classified based on their secretion method into two types: exocrine and endocrine.
- Exocrine glands secrete mucus, saliva, earwax, oil, milk, digestive enzymes, and other cell products via ducts or tubes.
- Endocrine glands lack ducts and secrete hormones directly into the fluid surrounding the gland.
Compound Epithelium
- Compound epithelium consists of multiple layers of cells.
- Its primary function is to provide protection against chemical and mechanical stresses.
- It covers the dry surface of the skin, the moist surface of the buccal cavity, pharynx, and the inner lining of ducts of salivary glands and pancreatic ducts.
Cell Junctions
- Cell junctions hold epithelial cells together with minimal intercellular material.
- Three types of cell junctions provide structural and functional links between cells: tight junctions, adhering junctions, and gap junctions.
- Tight junctions prevent substances from leaking across a tissue.
- Adhering junctions cement neighboring cells together.
- Gap junctions facilitate cell communication by connecting the cytoplasm of adjacent cells, allowing rapid transfer of ions, small molecules, and sometimes large molecules.
Connective Tissue
- Connective tissue is the most abundant and widely distributed tissue in complex animals.
- Its primary function is to link and support other tissues and organs in the body.
- Connective tissue ranges from soft connective tissues to specialized types.
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Description
Learn about the types of glandular epithelium and how glands are classified based on their secretion methods. Understand the difference between unicellular and multicellular glands, exocrine and endocrine glands.
