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Epithelial Tissue Video Lecture | Crash Course for NEET

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1. What are the main functions of epithelial tissue?
Ans. Epithelial tissue serves several key functions, including protection, absorption, secretion, and sensation. It acts as a barrier to protect underlying tissues from mechanical injury, pathogens, and fluid loss. Additionally, it plays a crucial role in absorbing nutrients (as seen in the intestines) and secreting various substances such as enzymes and hormones (as seen in glands).
2. How is epithelial tissue classified?
Ans. Epithelial tissue is classified based on two main criteria: the number of cell layers and the shape of the cells. It can be simple (one layer) or stratified (multiple layers). The cell shapes can be squamous (flat), cuboidal (cube-shaped), or columnar (tall and column-like). This classification helps in understanding the specific functions of different epithelial types.
3. What are the types of epithelial tissue found in the human body?
Ans. There are several types of epithelial tissue in the human body, including simple squamous, simple cuboidal, simple columnar, stratified squamous, stratified cuboidal, stratified columnar, transitional, and pseudostratified columnar epithelium. Each type has unique characteristics and functions, suited to specific locations in the body.
4. What is the role of epithelial tissue in absorption and secretion?
Ans. Epithelial tissue plays a critical role in absorption and secretion, especially in organs like the intestines and glands. In the intestines, simple columnar epithelium with microvilli increases surface area for nutrient absorption. In glands, epithelial cells are specialized to produce and secrete hormones, enzymes, and other substances necessary for bodily functions.
5. How does epithelial tissue contribute to the overall health of the body?
Ans. Epithelial tissue contributes to overall health by providing a protective barrier against environmental hazards like pathogens and toxins. It also facilitates the absorption of essential nutrients and the secretion of hormones and enzymes that regulate various bodily processes. Healthy epithelial tissue is vital for maintaining homeostasis and preventing diseases.
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