Tissue Flashcards
are collections of specialized cells and the extracellular substances surrounding them.
Tissues
four types of body tissues:
epithelial tissue
connective tissue
muscle tissue
nervous tissue
____, or epithelium, covers and protects surfaces, both outside and inside the body
Epithelial tissue
Epithelial tissue other term
epithelium
Functions of Epithelial tissue
Protecting underlying structures. Acting as a barrier. Permitting the passage of substances. Secreting substances. Absorbing substances.
Single layer of cells according to Epithelial tissue
Simple epithelium
What are the shape of simple cell
Squamous
Cuboidal
Columnar
More than one layer of cells
Stratified epithelium
Stratified cell shape
Squamous Nonkeratinized (moist) Keratinized Cuboidal (very rare) Columnar (very rare)
Modification of simple epithelium
Pseudostratified epithelium
Pseudostratified cell shape
Columnar
Modification of stratified epithelium
transitional epithelium
transitional cell shape
Roughly cuboidal to columnar when not stretched and squamouslike when stretched
Structure: single layer of flat, often hexagonal cell; the nuclei appear as a bumps when viewed as a cross section because the cells are so flat
Simple squamous epithelium
Function: Diffusion, filtration, some secretion, and some protection against friction
Simple squamous epithelium
Location: Lining a blood vessels (endothelium) and small ducts, alveoli of the lungs, portions of the kidney tubules, lining of serous membranes (mesothelium) of the body cavities (pleural, pericardial, peritoneal), and inner surface of the the tympanic membranes
Simple squamous epithelium
Lining a blood vessels
endothelium
lining of serous membranes
mesothelium
body cavities
pleural, pericardial, peritoneal
Structure: Single layer of cube shaped cells; some cells have microvilli (kidney tubules) or cilia (terminal bronchioles of the lungs)
Simple cuboidal epithelium
kidney tubules
microvilli
terminal bronchioles of the lungs
cilia
Function: Secretion and absorption by cells of the of glands and choroid plexuses; movement of particles embedded in mucus out of the terminal bronchioles by ciliated cells
Simple cuboidal epithelium
Location: Kidney tubules, glands and their ducts, choroid plexuses of the brain, lining of terminal bronchioles of the lings, surfaces of the ovaries.
Simple cuboidal epithelium
Structure: single layer of tall, narrow cells; some cells have cilia (bronchioles of lungs, auditory tubes, uterine tubes, and uterus) and microvilli (intestines
Simple columnar epithelium
Movement of particles out of the bronchioles of the lungs by ciliated cells; partially responsible for the movement of oocytes through the uterine tubes by ciliated cells of the glands, the stomach, and the intestines; absorption by cells of the small and large intestines.
Simple cuboidal epithelium
Location: Glands and some ducts, bronchioles of the lungs, auditory tubes, uterus, uterine tubes, stomach, intestines, gall bladder, bile ducts, ventricles of the brain
Simple cuboidal epithelium
Structure: multiple layers of cells that are cube-shaped in the basal layer and progressively flattened toward the surface; the epithelium can be nonkeratinized (moist) or keratinized; in nonkeratinized stratified squamous epithelium, the surface cells retain a nucleus and cytoplasm; in keratinized stratified epithelium; the cytoplasm of cells at the surface is replaced by a protein called keratin, and the cells are dead.
Stratified squamous epithelium
Function: protection against abrasion; a barrier against infection, reduction of water loss from the body
Simple cuboidal epithelium
Location: keratinized - primarily in skin; nonkeratinized- mouth, throat, larynx, esophagus, anus, vagina, inferior urethra, cornea
Simple cuboidal epithelium
Structure: multiple layers of somewhat cube-shaped cells
Stratified cuboidal epithelium
Function: secretion, absorpation, protection against infection
Stratified cuboidal epithelium
Location: sweat gland ducts, ovarian follicular cells, salivary gland ducts
Stratified cuboidal epithelium
Structure: multiple layers of cells with tall, thin cells resting on layers of more cube-shaped cells; the cells are ciliated in the larynx.
Stratified columnar epithelium
Function: Protection, secretion
Stratified columnar epithelium
Location: Mammary gland ducts, larynx, a portion of the male urethra
Stratified columnar epithelium
Structure: single layer of cells; some cells are tall and thin and reach the free surface, and others do not; the nuclei of these cells are at different levels and appear stratified; the cells are almost always ciliated and are associated with goblet cells that secrete mucus onto the free surface
Pseudostratified columnar epithelium
Function: Synthesize and secret mucus onto the free surface; move mucus (or fluid) that contains foreign particles over the surface of the free surface and from passages.
Pseudostratified columnar epithelium
Location: Lining of the nasal cavity, nasal sinuses, auditory tubbes, pharynx, trachea, bronchi of the lungs
Pseudostratified columnar epithelium
Structure: stratified cells that appear cube shaped when the organ or tube is not stretched and squamous when the organ or tube is stretched by fluid; the number of layers also decreases on stretch
Transitional epithelium
Function: accommodate fluctuation in the volume of fluid in organs or tubes; protect against the caustic effects of urin
Pseudostratified columnar epithelium
Location: lining of the urinary bladder, ureters, superior urethra
Pseudostratified columnar epithelium
is the most abundant tissue in the human body
Connective tissue
its main functions are to bind tissues together, reinforcement, insulation, protection and support
Connective tissue
functions of connective tissue:
- Enclosing and separating other tissues.
- Connecting tissues to one another.
- Supporting and moving parts of the body.
- Storing compounds.
- Cushioning and insulating
- Transporting
- Protecting
Structure: the mesenchymal cells are irregularly shaped; the extracellular matrix is abundant and contains scattered reticular fibers
Mesenchyme
Location: Mesenchyme is the embryonic tissue from which connective tissues, as well as other tissues, arise
Mesenchyme
Structure: mucous tissue is mesenchymal tissue that remains unspecialized; the cells are irregularly shaped; the extracellular matrix is abundant and contains scattered reticular fibers
Mucous connective tissue
Location: umbilical cord of newborn
Mesenchyme
Structure: cells within a fine network of mostly collagen fibers; often merges with denser conncetive tissue
areolar connective tissue
Function: Loose packing, support, and nourishment for the structures with which it is associated
areolar connective tissue
Location: widely distributed throughout the body; substance on which epithelial basement membranes rest; packing between glands, muscles, and nerves attaches the skin to underlying tissues
areolar connective tissue