types of tissues (histology) Flashcards
what is histology?
study of tissues
what are the 4 main tissue types?
- epithelial
- connective
- muscular
- nervous
what is epithelial tissue?
first line of defense from physical, chemical, and biological damage
what is connective tissue?
supports & connects all tissues can cells
what is muscular tissue for?
movement
what is nervous tissue for?
to control bodily functions
where is epithelial tissue found?
covers the body parts that are exposed to the environment
ex: digestive tract
what is the 1 thing epithelial tissue contains and 1 thing the tissue does not contain?
contain: nerves
does not contain: blood vessels
how are there constantly new epithelial tissue?
regeneration
what are the 5 types of epithelial tissue?
- simple
- stratified
- pseudostratified
- transitional
- glandular
what are the 3 types of simple epithelial tissue?
- squamous
- cuboidal
- columnar
what does “simple tissue” mean?
only 1 layer of cells for protection, absorption, and filtration
what is simple squamous epithelial tissue and where is it found?
1 layer of horizontal rectangular tissue found in lymph vessels
what is simple cuboidal epithelial tissue and where is it found?
1 layer of cube-like tissue found in the exocrine glands and kidneys
what is simple columnar epithelial tissue and where is it found?
1 layer of vertical rectangular tissue found in the small & large intestines
what is pseudostratified epithelial tissue and where is it found?
1 layer of cells that are different sizes and has cilia to block foreign particles found in the respiratory tract
what is transitional epithelial tissue and where is it found?
1 layer of cells of different sizes which can stretch and return back to normal shape again found in the urinary bladder
what are the 2 types of glandular epithelial tissue?
- exocrine gland
- endocrine gland
what are the endocrine glands?
ductless glands which make hormones that are secreted into the blood
what are exocrine glands?
duct glands that secrete fluid
what are the 4 types of exocrine glands?
- salivary
- mammary
- mucous
- sweat
what are salivary glands?
saliva that is secreted to aid in digestion
what are mammary glands?
makes milk for babies
what is mucous glands?
mucus is secreted to protect digestive & respiratory tract
what is sweat glands?
regulates body temp
what tissue is the most abundant in the body?
connective tissue
what are the 6 functions of connective tissue?
- binding
- support
- protection
- storage
- insulation
- transportation
what are the 5 types of connective tissue?
- mesenchyme
- bone
- cartilage
- dense connective
- loose connective
what type of tissue is the origin for all connective tissue?
mesenchyme
where is mesenchym found?
embryo
what are the 3 functions of osteocytes in bone tissue?
- protect
- support
- mineral storage
what are the 3 types of cartilage?
- hyaline
- elastic
- fibrocartilage
what are the 4 places hyaline cartilage is found?
- end of long bones
- nose
- trachea
- larynx
what is the function of hyaline cartilage?
to cushion the joints
what is the function of elastic cartilage?
to main shape and allow for flexibility
where is the 2 places elastic cartilage found?
- epiglottis
- ear
what is the function of fibrocartilage?
strength & absorption of compressive shock
what are the 2 places fibrocartilage is found?
- intervertebral discs (miniscus)
- discs of knee joints
what are the 2 types of dense connective tissue?
- dense regular
- dense irregular
what is the difference between the functions of dense irregular and dense regular connective tissue?
dense regular tissue can only withstand tension going in one direction, whereas dense irregular tissue can withstand tension going in multiple directions
where are the 2 places dense regular connective tissue located?
- tendons
- ligaments
where are the 2 places dense irregular connective tissue is located?
- dermis
- digestive tract
what are the 4 types of loose connective tissue?
- areolar
- adipose
- blood
- reticular
what is the function of areolar tissue?
it wraps around organs to cushion it
what type of cells is adipose tissue?
fat cells
what are the 4 functions of adipose tissue?
- provide energy
- insulation
- support
- protection
where are the 3 places adipose tissue is located?
- under skin
- kidney
- around eyeballs
what is the function of reticular tissue?
with the use of reticular fibers, it is the internal framework for organs and supports them
where are the 3 places reticular tissue is found?
- lymph nodes
- bone
- spleen
what is the function of blood and where is it located?
to transport, in blood vessels
what are the 3 types of muscle tissue?
- smooth
- cardiac
- skeletal
what does it mean when a tissue is striated?
that means there is a repeating pattern of lines within the tissue
what of the 3 types of muscle tissue is striated?
skeletal and cardiac tissue is striated and smooth tissue is not striated
where are skeletal muscles attached to?
attached to bones
where is cardiac muscle located?
only in the heart
to identify cardiac muscle tissue what should you look for?
intercalated discs
where is smooth muscle tissue located?
walls of internal organs like digestive tract, urinary, uterus, blood vessels
what does nervous tissue do?
control bodily functions
what are the 2 cell types of nervous tissue?
- neuron
- supporting cells
what are neurons?
conduct nerve impulses and communicate using neurotransmitters
what are supporting cells?
protect the neurons and are non conducting
what are epithelial membranes made of?
connective and epithelial tissue
what are the 3 types of epithelial membranes?
- cutaneous
- mucous
- serous
what is cutaneous epithelial membrane made of?
made of keratinized stratified squamous epithelium
where is cutaneous epithelial membrane located?
covers the entire body
what is the function of mucous epithelial membrane?
wet, moist cells for absorption and secretion
where is mucous epithelial membrane located?
lines cavities of digestive & respiratory tract
what is mucous epithelial membrane made of?
stratified squamous, simple columnar, or pseudostratified
where is the serous epithelial membrane located?
lines the pericardial, pleural, and abdominal cavities
what is the serous epithelial membrane made of?
simple squamous epithelium and thin layers of loose connective tissue
what are the 3 types of serous epithelial membrane?
- visceral peritoneum
- parietal peritoneum
- serous fluid
what is the visceral peritoneum?
membrane that is closest to the organ it surrounds
what is parietal peritoneum?
membrane that is farthest from the organ it surrounds
what is serous fluid?
fluid between visceral and parietal peritoneum and it provides lubrication to reduce friction