BIO102 Unit 2 Tissues and the Integumentary Assignment 1 (1).docx

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BIO102 Unit 2: Tissues and the Integumentary Assignment 1 1. Describe all epithelial tissues, including cell shape, layers, locations, and functions of each type. 1) Simple Squamous: A simple squamous epithelium is a single layer of flat cells, that are in contact with the basal lamina of the epithelium. This type of epithelium is permeable and occurs where small molecules need to pass quickly through membranes via diffusion or filtration. 2) Simple Cuboidal: Simple cuboidal epithelium is epithelial tissue found in the body. It is a single layer of thick made of cube-shaped cells. This type of tissue is found lining parts of the body such as the walls of the respiratory bronchioles and kidney tubules. 3) Simple Columnar: A simple columnar epithelium is a single layer of columnar cells attached to the base membrane; they are oval-shaped nuclei located in the basal region. In humans, they line most organs of the digestive tract including the small intestine, stomach, and large intestine. 4) Pseudostratified: Pseudostratified columnar epithelia are tissues are formed by a single layer of cells that give the illusion of being made from multiple layers. This is especially true when seen in the cross section. The nuclei of these cells are at different levels leading to the illusion of being stratified. 2. Describe the different types of cell junctions and provide examples of each type. Adherens junctions, and hemidesmosomes, desmosomes (anchoring junctions) A cell junction whose cytoplasmic face is locked to the actin cytoskeleton. Gap junctions which is communicating junctions. A special intercellular connection between a multitude of animal cells. They connect the cytoplasm of two cells, which allows molecules, ions and electrical impulses to directly pass through a gate between cells. Tight junctions occluding junctions. These are areas where the membranes of two adjacent cells join to form a barrier. The cell membrane connects by strands of transmembrane proteins such as occludins and claudins. 3. Explain the functions of cell junctions, provide examples. Cell junctions help hold our cells together. Cell junctions also enable communication between neighboring cells via specialized protein complexes called communicating junctions. 4. Describe all connective tissues, including cell shape, layers, locations, and functions of each type.

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