<< Chapter < Page Chapter >> Page >

Connective tissues

Connective tissues are made up of a matrix consisting of living cells and a non-living substance, called the ground substance. The ground substance is made of an organic substance (usually a protein) and an inorganic substance (usually a mineral or water). The principal cell of connective tissues is the fibroblast. This cell makes the fibers found in nearly all of the connective tissues. Fibroblasts are motile, able to carry out mitosis, and can synthesize whichever connective tissue is needed. Macrophages, lymphocytes, and, occasionally, leukocytes can be found in some of the tissues. Some tissues have specialized cells that are not found in the others. The matrix    in connective tissues gives the tissue its density. When a connective tissue has a high concentration of cells or fibers, it has proportionally a less dense matrix.

The organic portion or protein fibers found in connective tissues are either collagen, elastic, or reticular fibers. Collagen fibers provide strength to the tissue, preventing it from being torn or separated from the surrounding tissues. Elastic fibers are made of the protein elastin; this fiber can stretch to one and one half of its length and return to its original size and shape. Elastic fibers provide flexibility to the tissues. Reticular fibers are the third type of protein fiber found in connective tissues. This fiber consists of thin strands of collagen that form a network of fibers to support the tissue and other organs to which it is connected. The various types of connective tissues, the types of cells and fibers they are made of, and sample locations of the tissues is summarized in [link] .

Connective Tissues
Tissue Cells Fibers Location
loose/areolar fibroblasts, macrophages, some lymphocytes, some neutrophils few: collagen, elastic, reticular around blood vessels; anchors epithelia
dense, fibrous connective tissue fibroblasts, macrophages, mostly collagen irregular: skin regular: tendons, ligaments
cartilage chondrocytes, chondroblasts hyaline: few collagen fibrocartilage: large amount of collagen shark skeleton, fetal bones, human ears, intervertebral discs
bone osteoblasts, osteocytes, osteoclasts some: collagen, elastic vertebrate skeletons
adipose adipocytes few adipose (fat)
blood red blood cells, white blood cells none blood

Loose/areolar connective tissue

Loose connective tissue , also called areolar connective tissue, has a sampling of all of the components of a connective tissue. As illustrated in [link] , loose connective tissue has some fibroblasts; macrophages are present as well. Collagen fibers are relatively wide and stain a light pink, while elastic fibers are thin and stain dark blue to black. The space between the formed elements of the tissue is filled with the matrix. The material in the connective tissue gives it a loose consistency similar to a cotton ball that has been pulled apart. Loose connective tissue is found around every blood vessel and helps to keep the vessel in place. The tissue is also found around and between most body organs. In summary, areolar tissue is tough, yet flexible, and comprises membranes.

Questions & Answers

explain sexual reproduction of a named flower taking account of pollination, fertilization and the change to seed and fruit.
Chinyi Reply
The study of all life or living matterThe living organisms of a particular region.
Oyewale Reply
what is ology
Green Reply
in which of the following stages of the cell cycle are chromosomes pulled apart to opposite poles of the cell
Amie Reply
Anaphase
Jonah
what is digestive system
Cyprain Reply
Digestive system is a system in mammals associated with the breaking down or assimilation of food substances into simple soluble and diffusable substances by mechanical and chemical means
Emmanuel
what is symbiotic factors of an organisms
Emmanuel Reply
what are Nephron's
Simon Reply
cells of the kidneys
Nanmwa
what is biology
Abubakar Reply
Describe cellular event during meiosis
Nkeng Reply
what is the difference between compound light microscope and electron microscope
Nadia Reply
Hy can u help me plz
Khurram
i need all meterial related to MCAT
Khurram
what is tracheids
Samuel Reply
what is the branches of biology
Iviyn Reply
botany zoology microorganisms
Jyoti
what are prokaryotic cell
Mutala
What is abiotic
Mawen Reply
what is prokaryotit
Akanpanam Reply
Deoxyribonucleic Acid
Ernestina Reply
Gd evening guys pls some should help me with the excretory function of the kidney
Fonki
separate waste (urine) from the body
Simon

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Biology' conversation and receive update notifications?

Ask