Chem and AP - Name: Colin Campbell_ Section: DL3_...

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Name: Colin Campbell __ Section: DL3 ___ Laboratory Report: Exercise 3: Body Membranes Purpose: This exercise is conducted with the primary goal of gaining an understanding of membranes. I will study the different types of membranes including, cutaneous, epithileal, mucous, serous, and synovial. Our tool for this observation will be our excellent by mail microscope. Upon review of the slides and material contained in our lab manual I will then answer questions relating to my observations. This is fundamental in understanding how these cells look. We will dissect a chicken wing to view all the skin and various membranes involved. As always, our main safety concerns are to make sure I use a clean workspace and handle all slides and the microscope with care. Broken slides cause a risk for cutting fingers and can be dangerous for animals and children. I will wear gloves and be careful with the cutting utensils needed for dissection of chicken wing. Activity 1: The Microscopic Structure of Cutaneous Membranes Observations: Keratinized stratified squamous epithelium is identified by the multiple layers of dead cells at the surface. Keratin accumulation within maturing cells effectively waterproofs the cells, blocking diffusion of nutrients and
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wastes. The cells subsequently die. Keratinized stratified squamous epithelium is found only in the skin! Questions: 1. What is keratin? Keratin is an extremely strong protein, which is a major component in skin, hair, nails, hooves, horns, and teeth. The amino acids, which combine to form keratin, have several unique properties, and depending on the levels of the various amino acids, keratin can be inflexible and hard, like hooves, or soft, as is the case with skin. Most of the keratin that people interact with is actually dead; hair, skin, and nails are all formed from dead cells which the body sheds as new cells push up from underneath. If the dead cells are kept in good condition, they will serve as an insulating layer to protect the delicate new keratin below them 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
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Chem and AP - Name: Colin Campbell_ Section: DL3_...

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