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Chp. 4 Tissues
Epithelial Tissue
Question | Answer |
---|---|
The characteristic of epithelial is ... | Celluarity, specialized contacts, polarity, avascular & innervated, and regeneration |
What is celluarity ? | composed of closely packed cells with little extra cellular space. |
What is specialized contacts ? | form sheets of epithelial tissue with many tight junctions and desomsomes. |
What is polarity ? | apical and basal surfaces. |
What is avascular & innervated ? | contains nerves but NO blood vessels ( cells are nourshied by diffusion ) |
What is regeneration ? | rapid mitosis to replace cells lost ( prevents entrance for bacteria or virsues ) |
What are 2 classfication of epithelial ? | Simple and Stratified Epithelia |
What is cell shape and what are those types ? | allows for a close packaging cells but differs in height ; which is squamous, cuboidal, & columnar. |
What is simple squamous and is its functions? | *filtration (kidney), *Gas exchange(lungs) rapid diffusion; *serection (serous memembrane) |
What are the differences between Endothelium and Mesotheluim ? | Endothelium provides slick friction- reducing lining in lymphatic vessels and in a hollow organs in cardiovascular system. Mesotheluim is found in serous memebrane of ventral body cavity and covering its organs. |
What is simple cuboidal and its functions ? | *secretion (kidney tubules & small glands {adernal} * absorption - kidney tubules |
What is simple columnar and its functions? | *absorption is the lining of the digestive tract from the STOMCACH TO THE RECTUM. *secretion of mucus {goblet cells } or enzymes. -Cilated type propels mucus or reproductive cells in uterus. |
What is pseudostratified columnar and its functions? | *sercetions of mucus {goblet cells} -propulsion of mucus {ciliary action} in the respiatory bronchi and trachea. |
What is stratified squamous and its functions? | -Regenrate from basal layer as apical layer is removed. *Protects underlying tissue in areas subject to abrasion. -Moist linings- {mouth, esphagous...} -Dry memebrane- {epiderm is of skin is called kernatinized} |
What is statified columnar and its functions? | -Regenerate from the basal layer as apical layer is removed. *Protection- {male urethra} *Secretion- large glands {Pancreas} |
What is Transitional epithelia ? | It forms the lining of the urinary organs; which is called stretching. As they fill with urine. |
What is Glandular Epithelia? | A gland is a single cell or a mass epithelial cells adapated for secretions. |
What is Endocrine and Exocrine Glands ? | Endocrine is ductless glands which interally secreting into the extra cellular space. Exocrine glands have ducts and are external which sercreting through ducts either out of the body by exocytosis. |
What are the modes of secretion ? | Merocrine, Holocrine,& {apocrine} |
What is Merocrine ? | When the products are secreted in exocytosis (E.G) Pancreas, sweat, & salivary glands. |
What is Holocrine ? | When the products are secreted by the rupture of gland cells. (E.G) Sebaceous Glands |