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15 Cards in this Set
- Front
- Back
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Tissue |
- A group of cells that usually have a common origin in an embryo and function together to carry out specialized activities |
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Cellular Junctions |
a. Tight Junctions b. Adherens Junctions c. Desosome d. Hemidesmosome e. Gap Junctions |
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Tight Junctions |
Look like they are tied together with strands of ropes sprawled everywhere like ivy vines. They consist of adjacent plasma membranes, and strands of trans-membrane proteins (ropes). |
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Adherens Junctions |
Looks like it has one big belt running across it. This belt is called the adhesion belt and consists of microfilaments, plaque and also transmembrane glycoproteins. |
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Desmosome |
Looks like two "disks" on either side of the adjacent plasma membranes. These disks are called "plaque" and have keratin filaments that protrude from them. Inbetween the disks are cadherin glycoproteins. |
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Hemidesmosome |
Look like desmosome but only one disk. This type of junction connects to the basement membrane so this is why there is only one plaque disk. Think of this as half a desmosome. However, the glycoproteins here are called integrins. |
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Gap Junctions |
These junctions look like they have holes in it with a depression. These holes however are actually connective "connexons". |
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Basic Types of Tissues in the Body |
1. Epithelial tissue 2. Connective tissue 3. Muscle tissue 4. Nervous tissue |
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Epithelial Tissue |
Consists of Epithelium which are jelly like cells that have nuclei. They are connected to the basement membrane and have nerves that connect through the basement and also through the connective. The basement membrane consists of the basil lamina and reticular lamina. The connective tissue is beneath this. Epithelial Tissue has lateral surfaces. These are the surfaces that border other epithelial cells (right beside eachother).The apical (free) surface is the top of the epithelium where there is no contact with any other cells. The basal surface is the bottom that touches the basement membrane. Seen in blood vessels and the heart to name a few. |
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Arrangement Types of Epithelial Tissues |
1. Simple - little circular cells that are not stacked 2. Pseudostratified - long tall cells that apear to be stacked but is actuall one single layer. 3. Stratified - multiple layers of simple |
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Cell Shapes of Epithelial Tissues |
1. Squamous - flat cells 2. Cuboidal - look like square/circular cells 3. Columnar - tall cells, look stretched |
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Connective Tissue Components |
1. Cells: -blast: generastes the matrix including fibers and ground substances -ctye: matrix maintenance 2. Fibers: -collagen fiber (strength) -elastic fiber (elasticity) -reticular fiber (support) 3. Ground substances: -water -glycosaminoglycans (GAGs) -Proteoglycans |
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Areas in Which Connective Tissue is Seen |
1. Cartilage 2. Bone 3. Blood 4. Connective tissue proper |
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Muscle Tissue |
1. Smooth Muscle: - No striations - Uninucleate - Spindle-shaped -Lining the walls of hollow organs 2. Cardiac Muscle: - Striations - Uninucliate - Branching - Interdigitate at intercalated discs - Propel blood into circulation 3. Skeletal Muscle - Striations - Multinucliate - Cylindrical - Attached to bone or skin |
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Nervous Tissue |
1. Neurons: - Excitable - Generate and conduct nerve impulses - Regulate and control body activities - Can not be regenerated 2. Neuroglial cells: - Non-excitable - Fill the between neurons - support and protect the neurons - can be regenerated |
