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Chapter 4.2: Tissues. Cell Shapes. Squamous Thin and flat Nucleus in the thickest part of the cell. Figure 4.4. Cell Shapes cont…. Cuboidal Square. Figure 4.4. Cell Shapes cont…. Columnar Rectangular. Figure 4.4. Simple Squamous Epithelium.
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Cell Shapes • Squamous • Thin and flat • Nucleus in the thickest part of the cell
Cell Shapes cont… • Cuboidal • Square
Cell Shapes cont… • Columnar • Rectangular
Simple Squamous Epithelium • Protected regions where absorption takes place • Ex: Kidneys, Lungs, Heart
Simple Cuboidal Epithelium • Limited protection where absorption/secretion happens • Ex: Pancreas, Salivary Glands
Simple Columnar Epithelium • Some protection, absorb, secrete • Ex: Stomach, Intestines
Pseudostratified Epithelium • All cells touch basement membrane • Nuclei at different places • Looks layered • Have cilia • Ex: Nasal cavity, Trachea, Bronchi
Transitional Epithelium • Able to stretch • Contain more than one shape of cells • Ex: Bladder
Stratified Squamous Epithelium • Where severe stess happens • Surface of skin
Glandular Epithelium • Mode of Secretion • Merocrine Glands • Produces mucus • Lubricates, Barrier, Perspiration
Modes of secretion cont… • Apocrine Glands • Milk production • Thicker, milkier sweat
Modes of Secretion cont… • Holocrine Glands • Skin oils • Waxy coating on hair
Types of Secretions • Serous—water containing enzymes • Mucous—thick, slippery mucus • Mixed—produces both