Chapter 5- Tissue Flashcards
What are cells organized into?
Tissue
What connect cell membranes to each other
Intercellular junctions
What junction is where the membranes of adjacent cells converge and fuse with the area of fusion surrounding the cells like a belt
Tight junction- sheetlike layers line the inside of digestive tract and blood vessels in brain
What junction has rivets or spot welds adjacent to skin cells, forming a reinforced structural unit
Desmosomes
What junctions are tubular channels that allow ions, nutrients, and other small molecules to move between the cells
Gap junctions- like a pore ( heart muscle and muscles of digestive tract)
What are the 4 major tissues
Epithelial muscle nervous connective
What tissues are found theought body surface and forms the under lining of body cavities, hollow organs and composes glands
Epithelial
What does epithelial tissue always have that is exposed to outside or internal open space
Apical surface
What thin layer anchors epithelium to underlying connective tissue
Basement membrane
What do epithelial tissues lack
Blood vessel, nutrients diffuse from connective tissues
What are characteristics of epithelial
Lack blood vessels. Cells readily divide (faster healing time) cells tightly packed( form effective barriers.)
Describe simple epithelial
One layer main function - absorption and filtration
Desribe stratified epithelial
More than one layer
Describe squamous
Thin, flattened cells, scalelike
Describes cuboidal epithelial
Cubelike cells
Describe columnar
Cells are elongated, taller than wide
What tissue is composed of a single layer of thin flattened cells that fit tightly together to form the air sacs of the lungs and walls of capillaries
Simple squamous epithelium
Where does diffusion and filtration occur for the body?
Capillaries
What tissue is composed of a single layer of cube shaped cells with centrally located spherical nuclei?
Simple cuboidal ex: garden hose
What tissue lines kidney tubules
Simple cuboidal epithelium
What function does simple cuboidal serve in the kidneys
Tubular secretion and reabsorption
What tissue is composed of a single layer of elongated cells with nuclei near the basement membrane
Simple columnar