Chapter 4 Flashcards
(31 cards)
what is a tissue?
a group of cells of similar structure that performs a common function; cells form tissues and tissues form organs
what are the different components of a tissue?
extracellular matrix: everything surrounding the cells that are composed of proteins and ground substances- water, nutrients, waste products, and CO2/O2
epithelial tissue
covers and protects
connective tissue
support and binding
muscle tissue
movement
nervous tissue
control
where can you generally find epithelial tissue?
skin, external and internal linings of organs, and the linings of body cavities
what are the characteristics of epithelial tissue?
basement membrane, underlying connective tissue, nucleus
functions of epithelial:
protection (skin), absorption (small intestine), secretion, excretion, filtration, sensation
where does everything that goes into or out of the body pass through?
epithelial tissue
simple epithelial tissue
one layer of cells
stratified eptihelial tissue
multiple layers of cells
squamous shape epithelial
squam/ous = scaly/pertaining to
thing and scale like
cuboidal shape epithelial
cube like
columnar shape
elongated and rectangular
simple squamous epithelial tissue
single layered and scale like
found in: alveoli, glomerulus of kidneys, lining of blood vessels, serous membranes
functions: rapid diffusion or transport across membranes and to secrete serous fluid (lubricant)
simple cuboidal epithelial tissue
single layer, cube or round shape
found in glands, ducts, portions of kidney tubules, thyroid gland
functions: limited protection, secretion, absorption
simple columnar epithelial tissue
elongated single layer, can be non-ciliated or ciliated
found in lining of stomach, intestine, gallbladder, uterine tubes and collecting ducts of kidneys
functions: protection, secretion, absorption
ciliated pseudostratified columnar epithelial tissue
all connected to basement membrane, looks stratified but not
found in lining of nasal cavity, trachea, bronchii; portions of male reproductive tract
functions: protection, secretion, moving mucus with cilia
stratified cuboidal epithelial tissue
multiple layers of round or cube like cells; found in sweat glands, ovaries and tubules in testes
functions: secretions of sweat and hormones, sperm productions
keratinized stratified squamous epithelial tissue
multiple layers; dead cells at top
found in epidermis
functions: resist abrasion, prevents water loss; bacterial invasion
non keratinized stratified squamous epithelial tissue
no dead cells; has mucous membranes
found in oral, vagine cavity
functions: inhibits bacterial, secretion. resist absorption
stratified columnar epithelial tissue
multiple elongated layers; found in small areas of pharynx, epiglottis, anus, mammary glands, salivary gland ducts, urethra
transitional epithelial tissue
surface cells are round and bulging; found in urinary tract: bladder and ureter
function to allow filling and stretch
