Histology Lab

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Histology
Purpose: What is the purpose of this exercise? The purpose of this exercise is to become more familiar with microscope and slides through observations of tissues. By looking at so many slides I am now much more comfortable at identifying some basic structures. The tissue slides were very important to my understanding of the tissue's function. By looking at the dense regular tendon I can see how supportive it is because of all of the fibers present. It connected what I had read and studied to an actual picture and that helps with memorization and understanding.

Are there any safety concerns associated with this exercise? If so, list what they are and what precautions should be taken. There are no safety concerns with this exercise.

Exercise 1: Epithelial Tissue

Data Table 1- Epithelial Tissue Observations

TISSUE TYPE
OBSERVATIONS
Simple SquamousCan see round nuclei, epithelial cells don't appear squamous, very close together Simple CuboidalSImilar in size, encircle white spaces, spaces are different sizes Simple Columnar (stomach)Different sizes, taller than wide, can see basal and apical surface but no featuers Simple Columnar (duodenum)Columnar cells, brush border, basement membrane, goblet cells, connective tissue, Stratified Squamous (keratinized)Cells different sizes, dark keratinized layer at surface, lighter layer of living cells with basement membrane separating it from connective tissue. Basement membrane is wavy. Stratified Squamous (non-keratinized)cells look flat, could see nucleus in a few, seemed to be layered Pseudostratified Ciliated Columnarcan see cilia, cells rounder near basement, and look longer and stretched near surface TransitionalRoundish cells, could see some binucleat cells, can't view slide as closely as book/web so cells look more spread out Stratified Cuboidal (online)2 distinct layers, round cells above a layer of more oval cells. Round cells about the same size and oval cells are similar in size. Stratified Columnar (online)Appears to have 2 layers, round to oval in shape and all about the same size Questions:

A.Why is the study of histology important in your overall understanding of anatomy and physiology? Since tissues form organs, understanding histology is critical to understanding the human body. Without tissue, there is no body just like without cells there is no tissue. The human structure of atoms, molecules, cells, tissue, organs, organ system and finally the organism are all intertwined and each structure plays a critical role. To not understand one of those structures and its form and function, is to not fully understand the organism. Our goal in anatomy/physiology is to understand the complete individual and how all of the parts work together, not as separate pieces.

B.How are epithelial tissues named? Epithelial tissues are named using the classification of simple, one layer of cells, or stratified, two or more layers of cells. The classification is then followed by the cell shape. Simple cuboidal tissue is a single layer of squarish or round cells (cube like).

C.Why are some epithelial tissues stratified? Some epithelial tissues are stratified because their function and location requires it. Stratified epithelial tissue provides protection from friction, abrasion, and foreign particles. The thicker the layers, the more protection it will provide. The mouth and the esophagus need stratified layers for protection against the constant abrasion of food. The skin is stratified and it protects the tissues below from injury. Thinner layers of tissue can't provide the protection than the thicker, stratified ones can.

D.Unlike squamous cells, cuboidal and columnar cells have large, open cytoplasms. Which of the functions of epithelial tissue are supported by having such big cells?
Cells that absorb or secrete need more area in the cytoplasm for organelles. Mucous production is a function of a cell so it...
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