Laszlo Vass, Ed.D. Version 42-0013-00-01
Lab Report Assistant
This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.
What is the purpose of this exercise?
The purpose of this exercise is to learn about the functions and locations of tissue types in the human body using prepared slides. We will learn the similarities and differences of four tissue classifications: epithelial, connective, muscular, and nervous. At the end of the lab we will be able to name and identify the major tissue types in the human body, identify the subcategories of tissue types through microscopic identification and inspection of corresponding photomicrographs and diagrams, state the location of the tissue types in the body, and identify the major functions of each of the tissue types in the body.
Are there any safety concerns associated with this exercise? If so, list what they are and what precautions should be taken.
Exercise 1: Epithelial Tissue
Data Table 1: Epithelial Tissue Observations|
TISSUE TYPE| OBSERVATIONS|
Simple Squamous| Large cells, prominent disc shaped nucleus, looks like a fried egg.| Simple Cuboidal| Spherical nuclei, large cell also, wide. | Simple Columnar (stomach)| Tall looking cells rather than wide, can see the basement membrane| Simple Columnar (duodenum)| Tall looking cells, can see connective tissue and basement membrane, goblet cells| Stratified Squamous (keratinized)| Cells different sizes, dark deratinized layer at the surface, lighter layer of living cells with basement membrane separating it from the connective tissue. Basement membrane is wavy| Stratified Squamous (non-keratinized)| Cells look flat, can see nucleus in a few, looked layerd| Pseudostratified Ciliated Columnar| Can see cilia, cells rounder nearer to basement, look longer and stretched near surface| Transitional| Round cells, some binucleat cells|
Stratified Cuboidal (online)| 2 distinct layers, round cells above a layer of more oval cells, both about the same size | Stratified Columnar (online)| Multiple layers, column shaped cells, can see connective tissue|
A. Why is the study of histology important in the overall understanding of anatomy and physiology? The study of histology is important in the overall understanding of anatomy and physiology because it complements the study of gross anatomy and provides the structural basis for understanding organ physiology. Histology allows for us to examine the structure and composition of our tissues so that we can better understand what makes up our muscles, bones, connective tissue and organs. The study of histology gives us a scientific basis for understanding how tissues function and thus better understanding how and why our bodies do what they do.
B. How are epithelial tissues named?
Epithelial cells are named according to two different systems. The first name they are given indicates the number of cell layers present and the second name describes the shape of its cells. Based on the number of cell layers there are simple and stratified epithelia. Simple epithelia consist of a single cell layers and stratified epithelia are composed of two or more cell layers stacked one on top of the other. The names of the shapes given to the cells are squamous cells which are flattened and scale-like, cuboidal cells which are boxlike and as tall as they are wide, and columnar cells which are tall and column shaped.
C. Why are some epithelial tissues stratified?