Tissues Flashcards
What is tissue?
A group of similar cells working together to perform a common function
Epithelial Tissue
layers of skin that form the covering of all body surfaces.
-protection, absorption
-keeps all organs separated
Connective tissues
-connects and binds body tissues together
-protects and cushions
-Some are vascularized or avascular
Muscle Tissue
to produce movement.
Nervous Tissue
Responsible for sending and receiving messages
Characteristics of Epithelial tissues
-cells fit closely together to form continuous sheets
-membrane always have one apical surface,(free surface)
-Lower surface of membrane rests on the basal surface
-Avascular(no blood supply)
-reproduce easily
How Epithelial tissues are classified
-simple= one layer
-stratified=more than one layer
-cuboidal=cube shaped
-squamous- flat
-columnar=column
-pseudostratified= false or appears
-transitional= cells that can stretch
Simple Squamous
a type of epithelial tissue that is a single layer of flattened cells
-Absorbs and secrets
-forms membranes lining body cavities and lining lungs and capillaries
-located in the air sacs of lungs, lining of the heart, blood vessels, and lymphatic vessels
Simple Cuboidal
a type of epithelial tissue that is a single layer of cube-shaped cells.
-secrets and absorbs
-located in the kidney tubes, ducts and secretory portions of small glands, and ovary surface
Simple Columnar
a type of epithelial tissue that is a single layer of tall, cylindrical cells
-absorb, secret mucus and enzymes
-located in the digestive track, small bronchi and uterine tubes.
Pseudostratified Columnar
a type of epithelial tissue that is one layer of different heights and shapes of cells
-secrets mucus
-located in the carrying ducts of large glands and in most of the upper respiratory tract
Transitional tissue
a type of epithelial tissue that resembles both stratified squamous and stratified cuboidal.
-Stretches and permits distention of the urinary bladder
-lines the ureters and part of the urethra
Stratified Squamous
-multiple layers of flat cells
-protects underlying tissues in areas of high friction
-located in the linings of the mouth and esophagus as well as the epidermis of the skin
Exocrine glands
-secretions empty through ducts to the epithelial surface
-includes sweat and oil glands
Endocrine Gland
-ductless since secretions diffuse into the blood vessels
-all secretions are hormones
Characteristics of connective tissue
-some tissue types are well vascularized
-some have poor blood supply or are avascular.
Extracellular matrix
non-living materials that surrounds living cells
-made up of ground substance and fibers
Fibers that make up the extracellular matrix
collagen(white) fibers
elastic(yellow) fibers
Reticular fibers
Areolar tissue
a connective tissue that is soft and pliable, wraps and cushions organs, holds tissue fluid, edema.
-located in package organs, surrounds capilares.
Adipose Tissue
commonly called fat
-similar matrix to areolar connective tissue
-closely packed adipocytes
-insulation against heat loss
-reserves food fuel
-protects organs
-located under skin, withing the abdomen and around organs such as the kidneys
Reticular connective tissue
interwoven reticular fibers and cells
-forms soft internal skeleton (stoma) that supports other cell types
-located in lymphoid organs(bone marrow, spleen, lymph nodes)
Dense regular connective tissue
dense fibrous tissue
-withstands great stress when pulling force is applied in one direction
-located in ligaments,tendons, and aponeuroses.
Dense Irregular connective tissue
irregularly arranged collagen fibers, with some elastic fibers
-able to withstand tension in many directions, provides structural strength.
-located in the dermis of skin, capsules of organs and joints, and the submucosa of digestive track
Blood
vascular tissue
-transports nutrients and waste throughout the cardiovascular system
-found all throughout the body in blood vessels
