CSCC Bio 2300 Unit 1 - Concept B -Questions and Correct Answers (Expert verified) / Latest Update 2024/2025/100% Pass
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Course
CSCC Bio 2300
Institution
CSCC Bio 2300
Tissue - collection of similar cells and the substance/material between them.
Serves a specific function.
Types of Tissue - Epithelium
Connective
Muscle
Nerve/Nervous
Classification of Epithelial Tissues -
Epithelial Definition - 1. Epithelia form the *surface* layer of the body.
CSCC Bio 2300 Unit 1 - Concept B -Questions and Co rrect Answers (Expert verified ) / Latest Update 2024/2025/ 100% Pass Tissue - ✔✔collection of similar cells and the substance/material between them. Serves a specific function. Types of Tissue - ✔✔Epithelium Connective Muscle Nerve/Nervous Classification of Epithelial Tissues - ✔✔ Epithel ial Definition - ✔✔1. Epithelia form the *surface* layer of the body. 2. Epithelia line *body cavities and hollow* organs/structures. 3. Epithelia constitute (make up) most *gland* tissue. Features of Epithelium - ✔✔1. Epithelial consist of one or more *layers*. 2. These cells are *tightly* packed, with little to no *extracellular* matrix between cells (meaning the cells are so closely packed that there is little substance between them. The fixed basal surface of an epithelium is fixed to an underlying connective tissue. What structurally separates the two different tissue types? - ✔✔basement membrane Epithelia lack blood vessels. What is the term that means lack of blood vessels? - ✔✔avascular What about an epithelial layer allows it monitor the environment through sensory input to the nervous system? - ✔✔although it lacks blood vessels, it has many sensory nerve endings. Transitional Epithelia - ✔✔1. Stratified epithelium 2. Transforms between *cuboidal and squamous* Pseudostratified Epithelia - ✔✔1. Simple epithelium (one layer) 2. All cells contact basal lamina 3. Not all cells reach apical surface Apical Cilia - ✔✔1. Cilia are finger -like, motile projections 2. Simple, columnar epi thelium, may be ciliated or non ciliated. Apical Microvilli - ✔✔Microvilli are *nonmotile* and serve to increase surface area. Because the microvilli appear fuzzy in the light microscope, cells with numerous microvilli are said to have a brush border. Dead/Living Apical Cells - ✔✔A stratified squamous epithelium has either *dead* or *living* cells as the *surface layer* . The dead cells contain the protein *keratin* . Therefore, stratified squamous epithelium is classified as *keratinized* or *nonkeratini zed*. Intercellular Junctions - ✔✔Epithelial cells are tightly connected to adjacent cells by these specializations: 1. Tight junctions 2. Adhering junctions 3. Desmosomes
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