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BIO 111 On-line Histology Tutorial

Epithelial Tissue. Simple squamous epitheliumSingle layer of flat cellsLine air sacs of the lungs and the capillaries. Simple Squamous Epithelium (5.1) Notice, they look like a

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BIO 111 On-line Histology Tutorial

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    1. BIO 111 On-line Histology Tutorial Cells and Tissues Instructor: Toni Burkhalter Revised on September 15th, 2004

    2. Epithelial Tissue Simple squamous epithelium Single layer of flat cells Line air sacs of the lungs and the capillaries

    3. Simple Squamous Epithelium (5.1) Notice, they look like a ‘fried egg’…flat but round

    4. Epithelial Tissue Simple cuboidal epithelium Single layer of cubed cells Line glands and tubes

    5. Simple Cuboidal Epithelium (5.2) They cells form a circle together because they line tubes

    6. Epithelial Tissue Simple columnar epithelium Single layer of long, thin cells Line most organs of the digestive tract

    7. Simple Columnar Epithelium (5.3) Notice that they look like columns

    8. Epithelial Tissue Stratified squamous epithelium Many layers of flat cells Found lining the mouth, throat, vagina and anal canal as well as the top layer of the skin

    9. Stratified Squamous Epithelium (5.5) Notice the layers of cells!

    10. Now that we have talked about the epithelial cells… Can you… Draw a simple columnar epithelial cell? Describe a stratified squamous epithelial tissue? State the function of the different types of epithelial cells?

    11. What does connective tissue look like? The cells are widely spaced with a lot of extracellular material

    12. What are the various types of connective tissue? Adipose tissue Dense connective tissue (old name = fibrous connective tissue) Cartilage Bone Blood

    13. ADIPOSE TISSUE or FAT(5.14) Notice the adipose tissue has the nucleus pushed up against the side of the cell Be able to identify the cell membrane and the nucleus on a slide in lab

    14. DENSE CONNECTIVE TISSUE (5.15) The dense connective tissue has waves of collagen fiber between the fibroblasts Fibroblasts are the collagen making cells!

    15. CARTILAGE – (5.16) specifically hyaline cartilage on this image These cells look like frog eggs to me! There are chondrocytes (the collagen making cells) and a lot of intercellular material

    16. BONE (5.19) Bone has a lot of information you will be responsible for identifying…let’s look at the next slide to figure it all out…

    17. BONE (5.19) You need to be able to label an osteonic canal it is the same thing as the central canal in this image Osteocyte in lacuna The osteocyte is the dark staining ‘dot’ on the image. It is a living bone cell The lacuna is the ‘space’ that he osteocyte occupies Canaliculi Those are the little lines between the osteocytes

    18. BLOOD (5.20) Notice that the red blood cells are lighter than the white blood cells! The red blood cells don’t have a nucleus, while the white blood cells have a dark staining nucleus Plasma is the liquid the blood cells float around in.

    19. Now that you have learned about connective tissue… Can you answer these questions? Which connective tissue cell doesn’t have a nucleus? Which connective tissue cell produces mineral salts? Which connective tissue cell produces collagen? Can you identify all the connective tissue cells?

    20. What are the Characteristics of Muscle Tissue? Something that is unique to muscle tissue is its ability to contract!

    21. Muscle Tissue There are three types of muscle Skeletal Attaches to bone Smooth Found in the walls of internal organs Cardiac Found in the walls of the heart

    22. SKELETAL MUSCLE (5.21) Notice the striations on the skeletal muscle Striations are stripes! Look at how we show what a muscle fiber is Skeletal muscle has many nuclei!

    23. SMOOTH MUSCLE (5.22) Smooth muscle does not have the striations Smooth muscle has one nucleus per muscle cell Notice what it looks like in comparison to skeletal muscle

    24. CARDIAC MUSCLE (5.23) Cardiac muscle has striations, but it also has intercalated discs Intercalated discs are where two muscle cells are joined together

    25. Now that we have discussed muscle… Can you answer the following questions? Which type of muscle has no striations? Which muscle can you move voluntarily? Which muscle has intercalated discs?

    26. Let’s look at the nervous tissue The function of the nervous tissue is to conduct messages throughout the body Look at the structure of the neuron or nerve

    27. Where is nervous tissue located? Nervous tissue is located in the nerves, brain and spinal cord.

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