Unit 2: Notes 1 Flashcards
what are tissues?
groups of similar cells, with common embryonic origin, that function together to carry out specialized at Tiffany’s
what is histology
The study of tissues
what is a pathologist
Studies cells and tissues to help other physicians make diagnosis
what are the four types of tissue
epithelial, connective, muscle, nervous
what is epithelial tissue
- covers body surfaces exposed to environment (skinway, airway)
- Lines body cavities, hollow organs, ducts
- forms glands
what is connective tissue
- fills internal spaces
- protects and supports body and organs
- binds organs
- transports
- provides immunity
- stores energy
what is muscle tissue
-specialized for contraction
•skeletal, cardiac, smooth
-generates force needed to move body
what is nervous tissue
- detects change inside and outside body
- carries electrical signals
what are the two types of epithelial tissue
covering and lining and glandular
what do the covering and lining of epithelial tissue do and in what forms are they in?
covers external surfaces
forms: digestive, respiratory, urinary
what does the glandular epithelial tissue do and what form does it come in
produce fluid secretions (sweat and hormones)
forms: various glands including the sweat glands
what are the functions of epithelial tissue
- provide physical protection
- Controls permeability
- provide sensation
- produce specialize secretions: protection or chemical messengers (hormones)
what are the general features of all epithelial tissue
- closely packed cells
- three surfaces
- avascular
- has a nerve supply
- has a high capacity for renewal
what are the closely packed cell’s structure in epithelial tissue
continuous sheets of single or multi layers
what are the three surfaces in all epithelial tissue
apical: top/superficial layer, exposed to body
lateral: side layer
Basal: bottom/Deep layer, attached to basement membrane
why does epithelial tissue have a high-capacity for renewal
because of wear and tear and injury
how does one classify epithelial tissue
by the number of cell layers in cell shape
what is simple
One cell layer
what is stratified
two or more layers
what is pseudostratified
false; appears to have multiple layers
what is squamous
thin and flat
what is cuboidal
tall and wide
what is columnar
secretion/absorption
what is transitional
changes shape as organ stretches
