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The major tissues of the body
when do the major types of tissue in the body develop?
in the embryonic period
Two types of epithelial tissue:
Major functions of epithelial tissue:
- sensory functions-skin, nose, eye, ear
- secretion-hormones,mucus,digestive juices
- absorption-exchange of gases between air +lungs
- excretion-lining of kidney tubes
4 classifications of membranous epithelial tissues:
- pseudostratified columnar
arrangement of epithelial cells in a single layer
epithelial cells layered one on another
the noncellular layer of adhesive, permeable material that connects the epithelial tissue to the underlying connective tissue.
- one layer of flat, scalelike cells.
- func: absorption by diffusion
- ex. air sacs of lungs, surface layer of pluera, pericardium, and peritoneum
simple cuboidal epithelium:
- one layer of cuboidal cells resting on a BM
- func: sercretion and absorption
- ex. ducts and tubes of many organs
simple columnar epithelium
- single layer of cells many of which have modified structure(goblet cells, cilia, microvilli)
- func: protection, secretion, absorption, moving of mucus
- ex. surface layer of the mucous lining of the stomach, intestines and part of the resp. tract
pseudostratified columnar epithelium
- although appearing stratified, they have one layer of cells touching the BM
- func: protection
- ex. found lining air passages of resp sys., and the urethra in men
stratified squamous epithelium
- multiple layers of flattened squamous cells at the free or outer layer can be keratinized and nonkera
- func: protection
- ex. surface of the mucous lining of mouth, esophagus, vagina(non-keratinized)
- surface of skin(keratinized)
stratified cuboidal epithelium
- 2 or more rows of low cuboidal cells arranged randomly over a BM
- func: protection
- ex. ducts of sweat glands, lining of pharynx, covering of portion of epiglottis.
- a unique arrangement of differing cell shapes in a stratified or layered epithelial sheet
- func: permits stretching
- ex. lining of urinary bladder and ureters
- fingerlike projections that increase the surface area and help absorb nutrients
- found in the intestines
extracellular matrix (ECM)
- the material between the cells.
- made up of proteins and proteoglycans
- ductless glands, they discharge their secretion products(hormones) directly into blood or intestinal fluid.
- ex. pituitary, thyroid, adrenal glands
- discharge their secretion products into ducts
- ex. salivary glands
most widespread and abundant tissue?
tissue classification for blood?
hairlike projections of cells. found in the lining of the respiratory tract
function of connective tissue
connects, supports, transports and protects
4 main types of connective tissue:
major functions of adipose tissue?
protection, insulation, support, and food reserve
connective tissue that arises during embryonic development from stem cell tissue
2 major types of membranes:
- epithelial(most common)-composed of epothelial tissue and an underlying layer of connective tissue
- connective tissue- composed exclusively of connective tissue no epithelial cells present
3 types epithelial membrane:
- cutaneous(skin)-covers body surfaces exposed to the external environment
- serous(parietal,visceral,pleura,peritoneum)-lines cavities that are not open to the external environemt. composed of two layers of tissue.
- mucous-epithelial membranes that line body surfaces opening directly to the exterior.
a type of connective tissue membrane:
synovial-line the spaces between bones and joints.
location of apocrine sweat glands:
the different classes of cartilage and most prevalent:
- hyaline- most prevalent
- most prevalent type.
- found in support rings of resp. tubes and covering the ends of bones.
- low amounts of collagen
- strongest and most durable type.
- located in intervertrebral disks.
- filled with a dense packing of collagen fibers
- contains few collagen fibers, but large number of fine elastic fibers that give it high degree of flexability.
- found in external ear, and larynx
major components of connective tissue and their functions:
- Extracellular matrix(ECM)-determine it's physical characterisitcs
- consist of fluid, gel or solid matrix with or without extracellular fibers(collagenous, reticular, and elastic)
- proteoglycans- thicken and hold together the tissue