Human Tissues

Human Tissues

1. Definition of Tissues: group of cells that have similar structure and that function together as a unit.

2. Four types of Tissues

   • Muscular Tissues
   • Epithelial Tissues
     • General Characteristics
       • Avascular, but innervated
     • Simple Squamous
       • Function: absorption and filtration processes
         • Location: blood and lymphatic vessels, air sacs of lungs, lining of the heart Function: secrets lubricating substance, allows diffusion and filtration
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     • Simple Cubical
       • Function: absorption and filtration processes
         • Location: secretory ducts of small glands, kidney tubules Function: allows secretion and absorbtion
     • simple columnar;
       • Function: secretes acid, digestive enzymes and mucous.
         • located in the stomach
     • protection, secretion, absorption, excretion, filtration, diffusion, and sensory reception.
     • pseudostratified
       • Function: absorption and filtration processes
         • Location: trachea and most of the upper respiratory tract (ciliated cells) Function: secretes mucus which is moved with cilia
   • Nervous Tissue
   • Connrctive tissue
     • blood
       • location: throughout the body
       • function: provides a mechanism by which gases, nutrients, wastes, and cells can be transported throughout the body.
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     • bone
       • location: in the skeleton
       • Fucntion: supports body
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     • loose
       • Areolar
         • function: holds organs in place
         • location: beneath the dermis layer and underneath epithelial tissue of all body system
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       • Apidose
         • location: beneath the skin, but is also found around internal organs.
           • function: store energy in the form of fat, also cushions and insulates the body
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       • Reticular
         • Location: around the kidney, liver, the spleen, and lymph nodes, Peyer's patches as well as in bone marrow.
           • function: support frameworks in the liver, lymphoid organs, capillary endothelial, and muscle fibers.
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     • dense
       • regular
         • location: in ligaments and tendons
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         • function: transfer forces to bones.
       • irregular
         • location: in the reticular layer of the dermis and it’s also in the sclera and in the deeper skin layers
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         • function: provides strength, making the skin resistant to tearing by stretching forces from different directions.
       • Elastic
         • location: tendons attach to bones, the intervertebral discs, and the pubic symphysis.
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         • function: hold connective tissues together, even during the movement of the body. It’s elastin is that after being stretched or compressed, it will return to its original shape.
     • cartilage
       • hyaline
         • location: in the nose, tracheal rings, and where the ribs join the sternum.
           • Function: helps hold the body together and provides support and flexibility to different parts of the body.
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       • Fibrocartilage
         • location: located in regions where tendons attach to bones, the intervertebral discs, and the pubic symphysis.
           • functions: helps fill in the torn part of the cartilage but not the ideal replacement.
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       • Elastic
         • location: located in the auricle of the ear and the epiglottis.
         • function: provides strength, and elasticity, and maintains the shape of certain structures such as the external ear.
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3. credita: https://www.histology.leeds.ac.uk/tissue_types/epithelia/epi_simple.php

4. nervous and muscle tissue

   • sketal tissue
     • location: It’s found in the muscles which are attached to the skeleton.
     • fucntion: its function is to make up the muscle tissues connected to the skeleton and are important in locomotion.
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   • Cardiac Muscle
     • location: The cardiac muscle is found in the walls of the heart.
     • function: The function is to work to keep your heart pumping through involuntary movements.
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   • Smooth Muscle
     • Location: The smooth muscle is located in the walls of hollow organs like your intestines and stomach.
     • function: its function is to help contract your intestines to push the food through your body.
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   • Nervous Tissue
     • location: it is found in the brain, spinal cord, and nerves.
     • function: its function is to coordinate and control many body activities.
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