Tissue Outline Flashcards
Tissues
Group of cells that perform specialized structural and functional roles
4 types of tissues
Epithelial connective muscle nervous
Avascular
Lacking blood vessels
Epithelial tissue
Covers all the body surfaces inside and out. Avascular
Epithelial tissue attached to
Basal Lamina
Epithelial tissue lacks
Blood vessels
Why does epithelial tissue heal rapidly
Epithelium reproduce readily
What does epithelial tissue being tightly packed do
Allows it to serve as a good barrier
Functions of epithelial tissue
Secretion excretion absorption and sensory reception
How does epithelial tissue get nutrients and gases
Diffusion & or osmosis
Simple squamous epithelium
Single layer of thin flat cells
Substances pass easily through
Simple squamous epithelium
Which tissue occurs where diffusion and filtration take place
Simple squamous epithelium
Simple squamous epithelium lines
Air sacs of lungs, forms walls of capillaries, and covers the membranes that line body cavities
Why can simple squamous epithelium be easily damaged
Thin
Simple
One layer
Squamous
Broad flat and round
Only difference between simple squamous epithelium and simple cuboidal epithelium
Cell structure
Air sacs of lungs
Alveolar walls
Simple cuboidal epithelium
Consists of a single layer of cube shaped cells with a centrally located spherical nuclei
Histology
Study of tissues
Covers ovaries
Simple cuboidal epithelium
Lines kidney tubules
Simple cuboidal epithelium
Why does the simple cuboidal epithelium line kidney tubules
Help with the function in secretion and absorption
Lines ducts of glands
Simple cuboidal epithelium
Why does simple cuboidal epithelium line ducts of glands
Help to secrete glandular products
Simple columnar epithelium
Elongated and composed of a single layer
Simple columnar epithelium occurs in
Lining of the uterus and various organs in the digestive tract, including the stomach and intestines
If stretched out look like columnar
Simple columnar epithelium
Sometimes have microvilli
Simple columnar epithelium
Simple columnar epithelium is relatively
Thick, provides protection for underlying tissues
Simple columnar epithelium secretes
Digestive fluids and absorbs nutrient molecules from digestion
Principal function of simple columnar epithelium
Absorption
Microvilli
Cylindrical processes that increase the surface area of the cell membrane
Simple columnar epithelium has goblet
Cells that secrete a protective fluid (mucus)
Pseudostratified columnar epithelium
Appear stratified or layered but isn’t. Looks layered due to nuclei at two or more levels
Stratified columnar
Meant for production, found in epiglottis anus and urethra
Pseudostratified columnar epithelium possesses
Cilia which extend from free surfaces and move constantly
Pseudostratified columnar epithelium has goblet
Cells that secrete mucus that is passed along by cilia
Pseudostratified columnar epithelium lines the passages of
Respiratory system and tubes of the reproductive system
Pseudostratified columnar epithelium in respiratory
Passages the mucus traps dust and the cilia move the particles out of the way
In reproductive tubes
The cilia of Pseudostratified columnar epithelium moves the sex cells from one region to another
Lungs produce
Boogers
Stratified squamous epithelium
Many layers of cells making this tissue thick
Stratified squamous epithelium forms
Outer layer of skin called the epidermis
As skin ages it accumulates a protein called
Keratin
Keratin function
Harden the skin cells to produce a protective material that prevents water from escaping and chemicals and microorganisms from entering
Stratified squamous epithelium found in
Epidermis, esophagus, vagina. Anything subjected to friction
As Stratified squamous epithelium makes new layers
Pushes old ones up
Stratified squamous epithelium close to
Vascular, get nutrients through diffusion of base membrane
Transitional epithelium
Specialized to respond to tension
Transitional epithelium found in
Lining of urinary bladder and passageways of the urinary system
Transitional epithelium forms
Expandable lining and forms a barrier to prevent the contents from diffusing out
Transitional epithelium helps with
Distention is the bladder
Endocrine goes
Directly into the blood stream
Transitional epithelium also helps with
Getting rid of bad stuff in urine
Glandular epithelium
Composed of cells that produce and secrete substances
Glandular epithelium occurs mostly
In the columnar and cuboidal epithelia
1 or more of Glandular epithelium cells make
Gland
Exocrine glands
Secrete their products onto internal or external surfaces
Endocrine glands
Glands that secrete into tissue fluid or blood
Merocrine
Fluid product released by cell membrane
Three types of exocrine glands
Merocrine apocrine and holocrine
Apocrine
Cell product pinched off in secretion
Connective tissue
Occurs throughout the body and is most abundant type of tissue by weight
Connective tissue binds
Structures together, provides support, serves as framework, fills spaces, stores fat, produces blood cells, provides protection against infections, helps to repair tissue damage
Connective tissue cells are
Farther apart, able to reproduce, in most cases have good blood supply
Two cell types found in connective tissue
Resident and wandering cells
Resident cells
Fibroblasts and mast cells
Fibroblasts
Most common and produce fibers by secreting proteins into the matrix
Mast cells
Large and located near blood vessels, release heparin
Heparin
Prevents clotting
Wandering cells
Include blood cells
Macrophage wandering cell
Specialized to carry on phagocytosis, help to clear foreign particle from cell
Macrophage resembles a
Big war
Types of connective tissue fibers
Collagenous, elastic, reticular
Connective tissue fibers produced
By fibroclatis
Collagenous fibers
Thick thread like parts composed of the protein collagen
Collagenous fibers flexible but
Only slightly elastic
Collagenous fibers very
Strong and hold structures together (tendons)
Collagenous fibers called
White fibers
Elastic fibers
Composed of microfibeils embedded in the molecules of a protein called elastin
Elastic fibers have less
Strength but very elastic
Elastic fibers easily stretched
And can resume original shape
Elastic fibers called
Yellow fibers
Reticular fibers
Thin and composed of collagen, help to support
Types of connective tissue
Loose (areolar) adipose, fibrous connective, cartilage, bone
Loose (areolar) connective tissue
Forms delicate thin membranes throughout the body
Loose (areolar) connective tissue cells are mainly
Fibroblasts
Loose (areolar) connective tissue binds to
Skin and underlying organs
Loose (areolar) connective tissue fills in
Spaces between muscles
Loose (areolar) connective tissue lies beneath
Epithelium where it provides nourishment to epithelial cells
Adipose tissue
Called fat. Is a specialized form of loose connective tissue
Adipose tissue found
Beneath the skin and in spaces between the muscles
Adipose tissue serves as
Protective cushion for joints and some organs
Adipose tissue functions as a barrier
Even beneath the skin
Adipose tissue stores
Excess nutrients in fat molecules
Fibrous connective tissue
Contains many closely packed thick collagenous fibers and a fine network of elastic fibers
Fibrous connective tissue has only
A few cells
Fibrous connective tissue very
Strong and binds structures together
Examples of Fibrous connective tissue
Tendons and ligaments
Fibrous connective tissue have poor
Blood supply so repair occurs slowly
Cartilage
Rigid connective tissue
Cartilage supports
Parts, provides frameworks and attachments, protects underlying tissues, and forms structural models for many developing bones
Cartilage composed largely of
Collagenous fibers embedded in a gel like substance
Chondrocytes
Make up cartilage
Cartilage enclosed in
A covering of certain kind of connective tissue called the skin
Why is cartilage repair slow
Lacks direct blood supply
3 types of cartilage
Hyaline, elastic and fibrocartilage
Hyaline cartilage
Most common, looks like milk glass
Hyaline cartilage location
Found at the ends of bones and in the soft part of the skull
Hyaline cartilage found in the
Supporting rings of carbon along passages
Elastic cartilage
Provides framework for the external tissue and parts of the larynx
Bone
Most rigid of connective tissue
Why is bone the most rigid connective tissue
Inorganic salts in the intracellular material
Bone provides
An internal support for cells structure
Bone protects
Most parts in various cavities
Bone serves as an attachment for
Ligaments
Bone forms
Blood cells and stores inorganic salts
Osteocytes
Bone cells
Bone has blood vessels
In osteonic canal for nutrient supply
Other connective tissue
Blood (vascular) and reticuloendothelial
Blood (vascular tissue)
Transports substances between body cells and external environment
Blood (vascular tissue) helps maintain
Stable internal conditions
Blood (vascular tissue) composed of
Cells called blood plasma
Blood plasma contain
Red blood cells, white blood cells, and platelets
Blood plasma
Made in the marrow of certain hollow bones
Muscle tissue
Contractile
Contractile
Change shape by becoming shorter and thicker
As muscles contract
Fibers pull at their attached ends and cause body parts to move
Three types of muscle tissue
Skeletal, smooth, cardiac
Skeletal muscle tissue
Found in muscles attached to bone
Skeletal muscle tissue is only
Voluntary muscle (controlled by conscious effort)
Skeletal muscle tissue long
And threadlike
Skeletal muscle tissue have light
And dark cross markings called striations
Striations
Lines
Skeletal muscle tissue has lots
Of nuclei, more nuclei per fiber than other tissue
Skeletal muscle tissue controls movements for
Head trunk limbs facial expressions etc
Smooth muscle tissue
Lacks striations
Smooth muscle tissue found in
Walls of hollow organs such as the stomach, urinary bladder, uterus and blood vessels
Smooth muscle tissue cannot be stimulated to
Contract by conscious effort so involuntary
Smooth muscle tissue moves
Food through the digestive tract (peristalsis)
Smooth muscle tissue constricts
Blood vessels and empties the urinary bladder
Nervous tissue
Found in the brain, spinal cord and peripheral nerves
Neurons or nerve cells
Basic cells of Nervous tissue
Neurons have
Cytoplasmic extension called dendrites or excites
Neurons are sensitive to
Certain types of changes in their surroundings
Neurons respond to changes by
Transmitting nerve impulses along nerve fibers to other neurons or to muscles or glands
Nervous tissue able to
Coordinate regulate and integrate many body functions
Nervous tissue contains
Neuralgia last cells
Nervous tissue looks like
Areolar but has neurons
Neuroglial cells
Support and bind components of nervous tissue together, carry on phagocytosis, supply nutrient to neurons