We will study their histology in blood smears. Fibres in connective tissue can be divided into three types: As the name suggests, elastin is elastic. The terms fibrocyte and fibroblast refer here to the inactive and active cells respectively - at times you will see the two terms used as synonyms without regard for the state of activity of the cell.
The collagen fibre on the left is cut transversely, showing round cross sections of the unit fibrils. Numerous examples are found in the images below. Lutz Slomianka last updated: Light microscopy does not reveal any substructure in the elastic fibres.
Toxins removed from the blood by the kidneys leave the body in the urine.
Lymphocytes manufacture antibodies, proteins which possess the ability to recognize and bind to foreign substances. Dense irregular connective Connective tissue blood provides strength in multiple directions by its dense bundles of fibers arranged in all directions.
Other good candidates are bone sections which contain yellow bone marrow or sections of lymph nodes which are often embedded in adipose tissue. Normoblasts are approximately the size of mature RBCs and stain almost the same since most ribosomes have been lost as more hemoglobin accumulates.
They are usually not visible in histological sections but can be demonstrated by using special stains. The cytoplasmic rims of the adipocytes form thin veils which enclose the open spaces which were occupied by the lipid droplets.
They may regenerate blood vessels or smooth muscle which have been lost as a consequence of tissue damage. These vary in their abundance and are free to migrate through the extracellular spaces. Ground substance is soluble in most of the solvents used to prepare histological sections and therefore not visible in ordinary sections.
The population of cells present in loose connective tissue determines the cellular function associated with this type of connective tissue.
They "retire" to the connective tissue of the lung were they can be identified by the accumulations of fine particles in their cytoplasm. Among these wandering cells are the mast cells ; these have a cell body filled with coarse granules that contain two biologically active substances, histamine and heparin.
Reticular fibres Reticular fibres are very delicate and form fine networks instead of thick bundles.
A good example is the dermis of the skin. Look for an indentation in the outline of the kidney, which corresponds to its hilus. Elastin is another fibrous protein. Resting fibroblasts typically have so little cytoplasm that the cells commonly appear, by light microscopy, as "naked" nuclei. In elastic ligaments, dense elastic fiber concentrations convey strong elastic properties while a lesser concentration of collagen serves simply as a mechanical stop to prevent over-stretching under severe stress.
Elastic fibres can form membranes - not unlike the collagen membrane in the basal lamina of epithelia. Lymphocytes are a type of leukoctye that is able to recognize foreign proteins and to respond to their presence by proliferating and differentiating into plasma cells.Connective tissues are specialized tissues, which provide support and hold the body’s tissues together.
Connective tissue is made up of a small fraction of cells and a majority of extracellular substance which keeps the cells separated. The two types of cells found in connective tissue include fibrocytes (or.
LIQUID CONNECTIVE TISSUE; found in the blood. Functions: RBC transport oxygen through the body. WBC help with the immune system and protect the body from infection and disease. Blood is considered a connective tissue for two basic reasons: (1) embryologically, it has the same origin (mesodermal) as do the other connective tissue types and (2) blood connects the body systems together bringing the needed oxygen, nutrients, hormones and other.
Epithelium Study Guide. Epithelial tissue comprises one of the four basic tissue joeshammas.com others are connective tissue (support cells, immune cells, blood cells), muscle tissue (contractile cells), and nervous joeshammas.com represent various combinations of these four basic tissue types, which thus comprise the entire body.
Connective tissues are specialized tissues, which provide support and hold the body’s tissues together. Connective tissue is made up of a small fraction of cells and a majority of extracellular substance which keeps the cells separated.
Connective tissue (CT) is one of the four basic types of animal tissue, along with epithelial tissue, muscle tissue, and nervous tissue. It develops from the mesoderm. Connective tissue is found in between other tissues everywhere in the body, including the nervous system.Download