BIOS 251 Week 4 Lab; Histology Activity Guide

Week 4 Lab Instructions Histology Activity Deliverable Points Part A Activity- Lab Worksheet: Histology 20 Part B Completed Histology Tables 10 685800197976Part A Step 1: Read the Entire Lab Packet Part A Step 1: Read the Entire Lab Packet 1.0– Read through the laboratory packet – SEE ATTACHED SHEETS 685800204497Part A Step 2: Come to the Lab with Proper PPE Part A Step 2: Come to the Lab with Proper PPE BACKGROUND: Primary tissue types are epithelial, connective, muscular, and nervous. Specific tissue types are the subcategories of the primary types. When identifying a specific tissue type, use the full name of the tissue, e.g. simple columnar epithelial tissue, not just simple columnar. Primary Tissue Type: Epithelial Characteristics: cellular, polar, avascular, regenerative Function: protection, absorption, secretion, sensation Location: covers all internal and external surfaces, openings, passageways Classification: # of layers- one layer = "simple"; multiple layers = "stratified" shape of cells: squamous (flat – cells much wider than they are tall), cuboidal (cube shaped – cells approx. the same height as width), and columnar (column shaped – cells taller than they are wide). Primary Tissue Type: Connective Characteristics: composed of specialized cells embedded within a non-living matrix. Matrix is a combination of ground substance and protein fibers. Ground substance is a mixture of interstitial fluid, cell adhesion proteins, and proteoglycans. Protein fibers include collagen, elastin, and reticulin. Function: structural framework, protection, support, energy storage, immunity Classification: based on cell types present, composition of ground substance, and types of protein fibers present Primary: Muscle Characteristics: Relatively long, slender cells containing contractile protein actin and myosin. Muscle is both excitable and contractile. 2978150144561Week 4 Lab Instructions Week 4 Lab Instructions BIOS251Page 1 of 14 Function: Movement of both skeletal elements and of material within hollow organs. Classification: Three types. Specific:A. Skeletal Muscle - long, multinucleate cells w/ obvious striations found in all skeletal muscles to provide voluntary movement. Nuclei are flattened against the edge of the cell. Specific:B. Smooth Muscle - spindle shaped w/ single, central nucleus. Found in walls of all body organs, blood vessels, etc, and function to propel substances along internal passageways; involuntary. Specific:C. Cardiac Muscle - Appears striated. However, cells are branched and uninucleate. Found only in the heart. Contains intercalated disc (cell junctions between cells). Primary: Nervous Characteristics: Composed of two broad categories of cells; neurons and glia (neuroglia). Neurons are the functional cells of the nervous system. Excitable. Glia are the supporting cells of the nervous system, with a variety of functions. Function: Provides integration and communication between body systems on a relatively fast, short time scale. Location: Found in the brain, spinal cord, and some collections of cell bodies (ganglia) in the periphery. Specific:A. Nervous - Ox Spinal Cord, motor nerve. Note the large triangular neuronal cell bodies with many protections. Most of the material visible consists of these entangled projections. Smaller purple stained dots are the nuclei of glial cells. PURPOSE: In this lab, you will be asked to identify some of the different