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Unformatted text preview: BIO LCV ­ LAB ANSWERS BIO LCV – LAB #1 – BODY ORGANISATION PAGE LAB 1 ­ 3, 1­4 What differences can you identify in the epithelial layer of the esophagus and intestine? What similarities do you see in these sections? Slides of stomach and colon are on demonstration. Stomach: Note the gastric pits in the epithelial lining. Colon: Note the numerous mucus secreting goblet cells in the epithelial layer. SKIN TISSUE LAYER TISSUE TYPE > keratin > (outer) epidermis > stratified squamous epithelium > dermis > fibro ­ dense (elastic) connective tissue > hypodermis > loose (areolar) connective tissue + adipocytes – Why is a stratified rather than a simple epithelial layer appropriate for the skin? multiple layers give protection and durability. – Burns are categorized in severity from first degree (least severe) to third degree (most severe). This terminology essentially describes the cell layers which have been damaged. What layers would be damaged in a second degree burn? epidermis and dermis – Describe the dermal layer in terms of structure/function. dense, fibrous ­ gives structure and elasticity – What is the function of the adipocyte cells in the hypodermis? thermoregulation (insulation) – Comment on one difference observed between the squirrel foot pad and scalp, and provide a functional explanation for this difference. squirrel foot pad needs to be tougher – thicker epithelial and keratin layers – What is a freckle? an area of increased pigment in the skin BIO LCV page 2 LAB 1­ ANSWERS INTESTINE TISSUE LAYER TISSUE TYPE mucosa > simple columnar epithelium – submucosa – loose (areolar) connective tissue – circular muscle – smooth – longitudinal muscle – smooth – serosa ­simple squamous epithelium – Is the epithelial layer of the intestine simple or stratified? Why would it have this structure rather than the other? simple – function is to absorb nutrients – Using diagrams or the slides of muscle tissue provided, identify the type of muscle tissue in the intestine. What distinguishing feature allowed you to identify it as such? smooth muscle – no striations – many nuclei (mononuclear cells), small cells – Sketch a segment of the colon mucosa and identify the cell types. columnar epithelial cell goblet cell – What difference did you observe in the epithelial tissue of the esophagus? Why is this more appropriate, given the function of the esophagus? Esophagus – has stratified squamous epithelium – to protect as rough food chunks pass BIO LCV LAB 1­ ANSWERS PAGE LAB 1 ­ 10 tracheal: ­ cilia ­ pseudo columnar epithelium ­ fibrous connective tissue ­ loose connective tissue ­ smooth muscle stomach: ­ columnar epith ­ loose connective tissue ­ smooth muscle scalp: ­ keratin ­ epithelial tissue ­ connective tissue esophagus: ­ stratified squamous epithelium ­ loose connective tissue ­ smooth muscle page 3 ...
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