what are the 4 major tissue types
epithelial tissue
connective tissue
muscle tissue
nervous tissue
what is a tissue
cells of similar type and function are clustered into layers or grouops
what is the broad function of epithelial tissue
covers and lines
what is the broad function of connective tissue
provides support
what is the broad function of muscle tissue
enables movement
what is the broad function of nervous tissue
controls work
what is epithelial tissue
sheets of cells that cover and line other tissues
well attached to underlying structures
have an exposed surface
what is glandular epithelia
epithelia involved in manufacturing and releasing substances
may occur individually or together as glands
some may lubricate parts of the body
some play a role in physiological events
what is an excretion
substances that ultimately leave the body
- sweat
- urine
- faeces
what is a secretion
substances that remain within the body
- hormones
- enzymes
what are the functions of epithelial tissue
protects, covers and and lines
filters biochemical substances
absorbs nutrients
provides sensory input
manufactures secretions and excretions
simple squamous
individual cells next to each other attach and form a single sheet of cells
often in internal body - easily damaged
often found where gases are exchanged so diffusion can occur - e.g. lungs
simple cuboidal
cube-like
cells stack uniformly one cell thick next to each other
very fragile
hardly any protection from any abrasion or movement
found in kidneys and lining urinary tract
good absorptive functions - allow for filtration
simple columnar
tightly, uniformly packed into columns
thicker so provides some protection
lines GI tract
needs to withstand more abrasion
good absorption
stratified squamous
one cell thick
no pattern, just tightly packed on the surface
area with high levels of abrasion
found on the skin and parts of the respiratory tract
strong - good structural integrity
stratified cuboidal
works in similar way to simple cuboidal
if outer cells are knocked the new cells can help to repair the damage
made of 2 or more layers
often found when glands are involved
stratified columnar
not found lots in the body
pillars stacked on top of each other
found in some areas of the urinary tract and in the female reproductive tract
pseudostratified
not stratified
allows for villi on the surface
goof for added protection and filtration
hairs trap microparticles in respiratory tract
transitional
only type of epithelial tissue able to stretch
found in bladder
when stretched the connections between cells do not break apart
what is a gland
a group of cells that can make and discharge a secretion
what is the start of the development of glands
the top layer of the epithelia starts to duplicate
moves down into the connective tissue
forms finger like projections into the connective tissue.
what is an endocrine gland
does not have ducts
secretions distributed throughout body
produce and secrete hormones into bloodstream or lymphatic system
what is the exocrine system
has ducts
discharge secretions directly into nearby areas
secretions act locally and do not normally enter circulation
usually contain enzymes
what are the 2 types of glandular ducts
simple - main duct un-branched
compound - main duct branched
-
Intro to Vet patients in the UK39
-
Endemic wildlife and leg11
-
Guinea Pigs16
-
Rabbits18
-
Rats13
-
Hamsters8
-
Parrots9
-
lizards8
-
Exotic animal behaviour18
-
SM behaviour 112
-
intro to anatomy and physiology31
-
The cell12
-
Tissues35
-
directional terminology20
-
Homeostasis27
-
The Heart30
-
Circulatory system9
-
The heart 215
-
Applied cardiovascular system10
-
Respiration 143
-
respiration 223
-
Misc.5
-
Cats1
-
dogs1
-
Integument24
-
nutrition22
-
Week 8 misc16
