Ch 39 Animal structure Flashcards
Tissue:
group of closely associated similarly specialized cells working together for a specific function
Developing tissues in most animals form 3 Germ layers: endoderm, mesoderm, and…
ectoderm
Organ:
structure made of multiple tissues to perform specific functions
4 classifications of Animal Tissues, what is the classification based on(2things)
Epithelial, Connective, Muscle, Nervous
- based on structure and function
Germ layers based strictly on developmental origins
what type of tissue is a continuous layer(sheet) of cells over a noncellular Basement membrane which covers a body surface or lines a body cavity
Epithelial Tissue (Epithelium)
4 functions of Epithelial tissue
protection absorption secretion sensation
3 Epithelial cell shapes and tissue Structures(describe)
Squamous, Cuboidal, Columnar (Cell shapes)
Structure
Simple: single layer, Stratified: many layers, Pseudostratified: 1layer with Unequal height
What type of Epithelium tissue:
Cells are flat and in a single layer and allow transport of substances by diffusion.
- in air sacs of lungs and blood vessel linings
Simple Squamous Epithelium
What is another word used for Blood vessel linings
Endothelium
Which 2 Epithelia line passageways, are specialized for secretion and absorption.
Simple Cuboidal and Columnar Epithelia
What do some Simple Cuboidal and Columnar Epithelia have for absorption
What are 4 examples of where these tissues are found
microvilli
gland duct, kidney tubules, digestive tract, respiratory tract
which Epitheium cells are in several layers. How are the lower layers compared to the upper layers. What is it used for rather than absorption?
Stratified Squamous Epithelium cells
- lower cells metabolically active, Upper cells Dead and flattened
- used for protection, continuously being replaced
Where are Stratified Squamous Epithelium cells found(2)
skin, inside mouth
which type of Epithelium has all cells attached to basement membrane, some not reaching the outer surface? what are they for?
Pseudostratisfied Epithelium
- for Secretion and Protection
Which epithelium is the Pseudo.Stratified Epith. similar to?
What are 2 example locations:
Columnar Epith.
- respiratory passages, ducts of glands
