BIO 201 Chapter 4 Verified Solutions

BIO 201 Chapter 4 Verified Solutions (SEM) Scanning Electron Microscope provides ️three dimensional pictures of an unsectioned tissue surface a gland consists of ️one or more cells that make and secrete a particular product Acinar= ️aveolar all epithelial cells except GLANDULAR EPITHELIUA, ️fit close together to form a continuous sheet All exocrine glands secrete their products... ️onto body surfaces (skin) or into body cavities- the unicellular directly and the multicellular via epithelium walled duct avascular ️contains no blood vessles basement membrane ️reinforces the epithelial sheet, helping it to resist stretching and tearing forces and defines the epithelial boundary. Basil lamina consists ️of glycoprotiens secreted by the epithelial cells and acts as a selective filter, determining which molecules to diffuse into the epithelium swell as acts as a scaffolding along which epithelial cells can migrate to repair a wound Capillaires consists exclusively of ️endothelium cells of the basal layer of transitional epithelium are ️cuboidal or columnar characteristics of epithelial tissues ️Polarity-"apical surface"-exposed surface Basil surface"-lower surface= apical basil polarity-cells regions near the upper surface differ from lower in both structure and function Cilia located on the apical surface of simple columnar epithelia help to ️move substances or cells through an internal passageway by ciliary action Columnar Cells ️tall and column shaped Connective tissue ️... Covering and Lining Epithelium forms... ️the outer layer of the skin, dips into and lines the open cavities of the cardiovascular, digestive and respiratory systems and covers the walls and organs of the closed ventral body cavity. cuboidal cells ️boxlike and as tall as they are wide Endocrine glands ️are ductless glands which produce hormones into the extracellular space to enter into the blood to organs endothelium ️"inner covering" Epithelial Tissues ️is a sheet of cells that covers body surface or lines a body cavity either as covering and lining epithelium or glandular epithelium. Fixed ️preserved Function of pseudo stratified columnar epithelium ️Secretion, particularly of mucus; propulsion of mucus by ciliary action Functions of simple cuboidal epithelium include ️secretion and absorption General role for each tissue type are ️covering-epithelial support-Connective Movement-Muscle Control-Nervous glands are classified as follows: ️endocrine - Internally secreting exocrine - externally secreting Glandular Epithelium ️fashions the glands of the body Groups of cells that are similar in structure and perform a common or related function are called ️Tissues Histology compliments the study of gross anatomy because ️together they provide the structural basis for understanding organ physiology holocrine glands ("holo"=all) ️accumulate there products within them until they rupture. hormones ️regulatory chemicals that are excreted by exocytosis directly into the extracellular space how stratified epithelia regenerates ️the cuboidal or columnar basil cells divide and push apically to replace the older squamous surface cells. In its role as an interface tissue, epithelium accomplishes many functions, including... ️Protection Absorption Filtration Excretion Secretion and Sensory Reception. innervated ️supplied by nerve fibers Keratin ️a tough protective protein usually found on outer layer of epidermis location of keratinized stratified squamous epithelia ️epide