Which of the following components is the second largest component in Connective Tissue.
A. Fibroblast
B. Macrophages
C. Mast cells
D. Plasma cells
Answers
Answer:
B.MICROPHAGES.
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Answer:
B. Macrophages
Explanation:
Connective Tissues
Connective tissues are the binding or supporting elements of the animal body. Their morphology is variable
but in each case the cells are relatively inconspicuous while the nonliving intercellular material is abundant,
giving the tissue its particular character and providing its strength. Connective tissues are classified primarily on
the basis of the nature and arrangement of the intercellular material, including the fibers contained within it.
EMBRYONIC CONNECTIVE TISSUE
Mesenchyme
Mesenchyme is the typical, unspecialized packing tissue of a developing embryo and its cells enter into the for-
mation of specialized tissues. In sections of vertebrate embryos, note the loose tissue under the skin (Figs. D1 and
D2). Look for stellate (star-shaped) cells with numerous cytoplasmic processes making contact with each other.
The nuclei are large while the cytoplasm is scanty. Note the clear intercellular spaces that, in the living condition,
are occupied by a fluid that constitutes the GROUND SUBSTANCE or MATRIX of the tissue. The matrix is permeated with
delicate RETICULAR FIBERS that cannot be seen without special stains. In older embryos, the cells and fibers aggregate
within the intercellular spaces, indicating the transformation of the mesenchyme into adult connective tissue
With the electron microscope the clear, amorphous cytoplasm of mesenchyme cells shows little sign of
metabolic activity; the fibers show clearly (Figs. D4a and D4b). Young mesenchyme is a multipotential tissue whose
further development produces supporting tissues, vascular tissues, blood, and smooth muscle. A small number
of mesenchymal cells remain in the adult as reserve elements with the ability to develop into a variety of tissues.
Mucous Tissue
As an embryo develops, the intercellular matrix of the mesenchyme thickens to become a mucoid jelly contain-
ing fine fibers, and the tissue transforms imperceptibly into mucous tissue. At this time the electron microscope
shows the appearance of extensive granular endoplasmic reticulum and free ribosomes within the mesenchymal
cells, indicating active protein production. Mucous tissue occurs temporarily in the normal development of sup-
porting tissues. It may be found in abundance as WHARTON’S JELLY of the umbilical cord where its development
does not progress further (Fig. D5). Note the CELLS and scanty FIBERS distributed throughout the pale, gelatinous
MATRIX. The cells, called FIBROBLASTS, have long processes that communicate with those of other cells. Fine fibrils
aggregate into bundles, the COLLAGENOUS FIBERS.
COMPONENTS OF ADULT CONNECTIVE TISSUES
Before discussing specific types of adult connective tissues we will describe separately the cells, fibers, and
intercellular substances that enter into the formation of these tissues. More of these components can be seen in
flattened whole mounts of AREOLAR CONNECTIVE TISSUE than in any other type of preparation. Areolar tissue is the
loose connective tissue that is abundant throughout the body, binding and supporting most organs. In the sample
shown here, the tissue was obtained by tearing away the skin from an anesthetized small mammal and removing
the tissue that connected it to the muscle or other tissue below. The tissue was spread on a slide, stained with
hematoxylin and eosin, and coverslipped.