Tissue Types

In Glogpedia

by SarahHammy
Last updated 5 years ago

Discipline:
Science
Subject:
Human Anatomy
Grade:
12

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Tissue Types

Tissue Types

Sarah H.

CONNECTIVETissue

M U S C L ETissue

NE R V O USTissue

E P I T H E L I A L Tissue

Epithelial tissue is found throughout the body; it covers organs andlines other surfaces. There are several types of cells found in epithelium: simple squamous, simple cuboidal, simple columnar, stratified squamous, stratified cuboidal, stratified columnar, pseudostratified and transitional. Each type of cell helps with different functions, functions that might include protection, secretion, absorption, excretion, or sensory reception. For example, simple squamous epithelium helps function in the exchange of gases in the lungs, lining of blood and lymph vessels, and protection by being the outer layer of the epidermis; simple cuboidal epithelium helps function in the secretion and absorption in the kidneys and secretion in glands; simple columnar epithelium protects underlying tissues in organs, helps increase availability of absorption in the intestine, and secretes mucus; psuedostratified columnar epithelium contribute through mucus secretion and ovular egg movement; stratified squamous epithelium protects various underlying layers of the body; stratified cuboidal epithelium lines many glands and provides greater protection; stratified columnar epithelium is a lining; and transitional epithelium helps with protection, secretion, and absorption.

<- This picture consists of the layers of the skin (epidermis and dermis), where the simple squamous cells are visible towards the top, basal cells towards the bottom.

Connective tissues function to bind, support, protect, fill spaces, store fat, etc. and there are several subdivisions: fibers, loose, adipose, dense, cartilage, bone, and blood. Strong collagenous fibers contribute to holding body parts together, elastic fibers add flexibility to other connective tissues, and reticular fibers support other tissues. Loose connective tissue helps bind body parts together and/or fill spaces within muscle, while adipose tissue is designed to store fat. Continuing on, dense connective tissue consists of more densely packed collagenous fibers and form tendons and ligaments, cartilage provides framework and acts as a shock absorber, bone acts as a support, and blood transports important substances throughout the body.

Exhibits a model of connective tissue fibers that hold body parts together. ->

Close up of dense connectivetissue.

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Close up of loose connectivetissue. ->

Muscle tissue is subdivided into three types: skeletal (2), smooth (1), and cardiac (3). Skeletal muscle is attached to bone, because bones make up the skeletal system, and are controlled therefore voluntary. The fibers are longer, striated, allowing it to contract when needed. Smooth muscle is an involuntary muscle found in organs, the digestive tract, blood vessels, and urinary bladder. It is not striated, uninucleate, and has spindle-shaped cells. Cardiac muscle tissue is an involuntary muscle found only in the heart and consists of branch-like fibers.

2

3

1

Nervous tissue is one of the most precious of tissues because it does not have the ability to reform/reproduce/heal in times of injury. Found in the brain, spinal cord, and nerves, neurons (or nerve cells) send impulses while neuroglia support and nourish the neurons.

<- Neurons are composed of an axon, dendrite, nucleus, and synapse. Dendrites are the branch-like structures that send/receive messages through synapses (the space between neurons). The axon carries the impulse from one dendrite to the next, acting like a tunnel.

In More Depth: Muscle Tissue

Although this is the same for every tissue type, when considering the three subdivisions of muscle tissue each has a specific function vital for survival. Smooth muscle tissue is located in organs, the digestive tract, blood vessels, and urinary bladder, which is important because of smooth muscle's ability to contract and move substances through each component. Skeletal muscle tissue is attached to bones that move the body voluntarily. The striated, long cells work to move parts of the body closer to the bone that the muscle is attached to, allowing movement of limbs. Finally, cardiac muscle tissue (found only in the heart) is an involuntary muscle responsible for pumping blood throughout the body. It self-stimulates therefore it is considered autorhythmic, it is striated which indicates it's strength, and the branch-like formation of the cells allow the cells to resist high blood pressures and maintain durability through a lifetime.

^ 6 cell types that are explained below.


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