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| Is a sheetlike tissue of cells that are close together, with little extracellular material between them. Epithelia line the body's surface and its cavaties,ducts,and tubes. Have one free surface exposed to the outside environment or a body fluid. |
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| Saclike,secretory organs that open to the free epithelial surface. They are derived from epithelium. Gland cells secrete products,unrelated to their own metabolism,that are to be used elswhere. |
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| Secrete many substances,such as oils,mucus,saliva,tears,milk,digestive enzymes,and earwax. They have ducts or tubes that open into epithelial surface. |
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| Have no ducts;they secrete their products,hormones,directly into interstitial fluid. Hormone milecules generally diffuse into neighboring blood capillaries,and the circulatory system transports them to target cells in tissues that are typically some distance away. |
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| Lock adjoing cells together in epithelia tissues. They are very common in skin and other tissues that are often subject to abrasion. |
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| Stop most substances from leaking across a tissue. Rows of proteins fuse each cell to its neghbors and form tight seals. They run parallel with the free surface of the tissue. |
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| Is a soft connective tissue. Fibroblasts and fibers are dispersed widely through the matrix. This tissue is the most common type in the vertebrate body,and helps hold organs and epithelia in place. |
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| Fibrous,Irregular Connective Tissue |
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Definition
| The matrix is packed with many fibroblasts and collagen fibers that are positioned every which way. Dense, irregular connective tissue is a component of skin. Supports intestinal muscles and also forms protective capsules around organs that do not stretch much. |
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| Fibrous,Regular Connective Tissue |
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| Orderly rows of fibroblasts between parallel,tightly packed bundles of fibers. Helps keep tissue from being torn apart when placed under mechanical stress. Some examples are tendons and ligaments. |
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| A tissue of fine collagen fibers packed in a rubbery,compression-resistant matrix. Specialized cells secrete the rubbery material,chondrin,which then imprisons them. Human skeleton started out as cartilage. Supports the outer ear,nose,and throat. Protects and cushions joints between bones. Has no blood vessels. |
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| Hardened connective tissue with living cells imprisoned in their mineralized secretions. Main tissue of bones,the organs that interact with muscles to move the body and that support and protect soft internal organs. |
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| An energy reservoir. Cells of this tissue get swollen with stored fat that their nucleus and a few fibroblast nuclei are flattened and pushed to one side. Fat deposits under the skin form an insulating layer and cushion certain body parts. Accumulate around certain organs such as kidneys and heart. |
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| Is a connective tissue because its cellular components arise from stem cells in bone. Blood cells are suspended in plasma,a fluid extracellular matrix that functions in transport and heat transfer. Red blood cells get oxygen to metabolically active tissues and get rid of carbon dioxide wastes. White blood cells defend and repair tissues. Platelets function in blood clotting. |
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| The functional partner of bone that helps move and maintain the positions of the body and its parts. Has parallel arrays of long, cylindrical muscle fibers. Makes up 40% of the weight of an aberage humen. Voluntary muscles |
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| Occurs only in the heart wall. Contains sarcomeres and has a striated appearence. Consists of single branching cells that have a nucleus. Has a lot of mitochondria because of ATP intake from aerobic respiration to keep heart beating. Involuntary Muscle |
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| Located in the walls of soft internal organs,including the stomach bladder and uterus. Has single,unbranching cells,tapered at both ends,with one centrally positioned nucleus. Contracts slower than skeletal muscle tissue. |
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| Composed of neuraons and a variety of cells,collectively called neuroglia,that structurally and functionally support them. Diverse cells in this category structurally and functionally support the neurons. |
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| Are an excitable cell that makes up the communication lines in most nervous systems. They are basic units of communication in nervous tissue. Different kinds detect specific stimuli,integrate information,and issue or relay commands to other tissues. |
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| One of the three primary tissue layers,which are forerunners of all adult tissues and organs. It is the outer layer and is the first to form. It will give rise to epidermis and the nervous system. |
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| The middle layerand is the start of muscles,bones,and most of the circulatory,urinary,and reproductive systems. |
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| The inner primary tissue layer. It is the start of the lining of the digestive tract and organs derived from it. |
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| A compartmentalixation of functions that help the body survive in ways that no one tissue can offer. Organ systems divide up the tasks of securing,processing,and distributing materials,and expelling wastes, protectiong the body, integrating its activities,and reproducing. Contributes to the survival and reproduction of the whole body. |
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| Has the largest surface area. Consists of two layers, an underlying dermis and outer dermis. Skin stretches, conserves water, and fixes small cuts or burns. First line of defense against infections and diseases. |
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| A dense connective tissue with many fibers of stretch-resistant elastin and supportive collagen. Contains blood vessels, lymph vessels, and sensory receptors thread through it. |
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| A stratifies squamous epithelium with an abundance of adhering junctions and no extracellular matrix. Ongoing mitotic cell divisions in the deepest epidermal layers push previously formed cells toward the skin's surface. Outer layer of the skin. |
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