A&P Lab 3 - Name: Craig Nowakowski Section: DL3

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Name: Craig Nowakowski Section: DL3 Laboratory Report: Exercise 3: Body Membranes Purpose: The purpose of this exercise is to gain an understanding of the body membranes and thereby better understand our own bodies. Mucous membranes are epithelial membranes that consist of epithelial tissue that is attached to an underlying loose connective tissue. These membranes, sometimes called mucosae, line the body cavities that open to the outside. The entire digestive tract is lined with mucous membranes. Safety precations include proper care and handling of microscope, proper eye protection, hand sanitization handling raw food, and clean work surface. Activity 1: The Microscopic Structure of Cutaneous Membranes
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A stratified squamous epithelium consists of squamous (flattened) epithelial cells arranged in layers upon a basement membrane. Only one layer is in contact with the basement membrane; the other layers adhere to one another to maintain structural integrity. Questions: 1. What is keratin? Water-soluble fibrous protein found in the epidermis. Keratin is the main constituent of hair and nails, and contributes to the waterproofing of skin. 2. Why is your skin keratinized? Because skin needs to be tough and protective, its epithelial surface contains keratinized cells. That means that the epithelial cells, shortly after being born, begin to make a protein called keratin that they store inside of them. This protein is really tough. As the cells get older and older, more and more keratin is found within them. This continues until they get so full of keratin that they can't survive any more. When they die, they remain as packets of keratin that form a tough protective barrier that we appreciate for our skin. Activity 2: 
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This note was uploaded on 03/25/2010 for the course CHEM CHEM 181 taught by Professor Tamburro during the Spring '10 term at Ocean County College.

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A&P Lab 3 - Name: Craig Nowakowski Section: DL3

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