The connective tissue provides different functions in the organism such as support to other tissues, transportation of blood with blood vessels, and growth and repair when a wound occurs. Fibers are one of the main components of the connective tissue. There are three types of fibers and the most common and strongest type is collagen. The reticular and elastic fibers are the remaining two types of fibers which are going to be compared in term of structures and synthesis.
When it comes to structure, elastic and reticular fibers are really different because they have different functions. The elastic fiber is longer, have branching networks and have thin fibers, while the reticular fibers are shortest, have delicate networks and have collagenous
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Both synthesis occurs outside of the type of cell that synthesized each component of the fiber. Although these types of fibers start in the same way these processes differentiate from each other in the components that binds with each other to form each kind of fiber. To form the elastic fiber is just needed three components Tropoelastin which contains the amino acid desmosine, Fibulin 1 and Fibrillins 1 and 2. These components assemble with each other outside of the fibroblast, chondroblasts, or smooth muscle which are the cells that synthesis each component. Different from the elastic fibers, the reticular fibers synthesis is slightly different. In the RER occurs the synthesis of precollagen and procollagen, hydroxylation of lysine and proline, glycosylation, and disulfide bond formation. Then in the Golgi, occurs the package and secretion of preprocollagen. Outside of the cell, the procollagen is transformed in tropocollagen, and these molecules form a collagen fibril. The cross-linking of the collagen fibril forms collagen fiber which forms the reticular fibers. The difference between the collagen fibers and reticular fibers is that the collagen fibers are bigger or thicker than the reticular
No obvious boundaries are observed between the two distinct materials, tendon and bone. Type I collagen and tenocytes are highly aligned in tendon. In uncalcified fibrocartilage, where collagen type II is of great content, along with rich type III collagen and small amount of type X collagen, decorin, and aggrecan. Similarly, with a great amount of type II collagen, the mineralized cartilage presents significant amounts of collagen type X and scarce levels of aggrecan. Note that the collagen fibers are highly aligned in the direction of tensile force in tendon but less oriented in the insertion site (Figure 2).[4, 19] Additionally, the insertion site possesses a transitional decrease in tissue organization while an increase in mineral content.[4] The complex collagen and mineralization content in this region lead the repair and rehabilitation of tendon-to-bone insertion site more
The four different type of fiber types are: slow, fast and fatigue resistant, fast fatigable and fast intermediate. Slow muscle fibers have a long twitch time, which means that they have low peak forces, and have a high resistance to fatigue. These fibers are high in oxidative enzymes and are low in glycolytic markers and ATP activity.
Within skeletal muscle there are extremely small structures that form the muscle and allow contractions and movement to occur (epimysium, perimysium, endomysium, fascicles, fiber, sarcomere, sarcoplasmic reticulum and t tubules). These structures all play a role in protecting, connecting and transporting substances throughout the muscle fibers. They are also the main contributors to movement.
Not all attributes are obvious for every situation. The lion's share of instances of OI (conceivably 85-90 %) are created by a predominant change in a quality coding for sort I collagen (Types I, II, III, and IV in the accompanying rundown). Sorts VII and VIII are recently recognized structures that are acquired in a passive way. The qualities bringing about these two sorts have been recognized. Sorts V and VI don't have a sort 1 collagen change, however the qualities bringing about them have not yet been recognized. The general components of each referred to sort of OI are as per the
Repair after a muscle is damaged happens through the division of certain cells who then fuse to existing, undamaged muscle fibers to correct the damage. Different muscle types take different amounts of time to heal and regenerate after it has been damaged. Smooth muscle cells can regenerate with the greatest capacity due to their ability to divide and create many more cells to help out. While cardiac muscle cells hardly regenerate at all due to the lack of specialized cells that aid in repair and regeneration. In skeletal muscle, satellite cells aid in helping restoration after injury. Along with muscles, tendons are very important structures within the human body, and they to can be damaged. However, tendon repair involves fibroblast cells cross-linking collagen fibers that aid in not only reinforcing structural support, but also mechanical support as well (“Understanding Tendon Injury,” 2005). While quite different from muscle repair, tendon repair involves the similarity of reestablishing d...
Yan, R., 2011-2012. Reticulon 3 aggregation and its role in the formation of dystrophic neurites. [Online]
It has also been discovered that the components of Kevlar fiber, have a radial orientation that is in a crystal. Crystal-like regularity is the largest contributing factor in the strength of Kevlar fiber. PROPERTIES It is five times stronger, yet the same weight as steel. Kevlar Aramid fiber is an improved material, which is an extremely lightweight, man-made organic fiber. Kevlar fiber has a combination of properties, which makes Kevlar a very useful material.
The solution to this problem is located in the lab. Researchers across the country are working day in and day out to come up with a solution to accelerate the healing of soft tissues. They have come up with many solutions, from vibration therapy, to personalized rehab plans, but none of these are yielding truly significant results. I believe the solution lies at the molecular level. I believe that we can observe the healing of these soft connective tissues and learn from it. Then we can design a method from the observations to accelerate the production of the fibrils and collagen that will go on to make up the soft connective tissue. I have begun to take the beginning steps in solving this problem through my mentorship with Dr. Weinhold. Our research goals go hand in hand, which has led us to beginning research on the release of an angiogenic growth factor through a gelatin that will coat sutures. In theory, this angiogenic growth factor, once released from the crosslinking with the gelatin will stimulate the development of blood vessels around the recently repaired collagenous tissue. This, in turn, will allow the tendon/ligament to have a better oxygen supply and allow for quicker
Sembene Ousmane’s novel, “Gods Bits of Wood,” gives a highly detailed story of the railway strike of 1947-48 in French West Africa. It contains conflicts of political, emotional and moral nature. Ultimately, Sembene’s novel is one of empowerment. It brings to light the tension between colonial officials and the African community among the railway men as well as the struggle of the African community to free itself from being subjected to colonial power. Frederick Cooper’s article, “Our Strike: Equality, Anticolonial politics and the 1947-48 Railway Strike in French West Africa,” helps reveal the strike’s true meaning and agenda by analyzing the conflicts present in Sembene’s novel. In fact, it paints a very different picture of the railway strike than Sembene’s novel.
When observing both cell types under a microscope several differences are obvious. Firstly, skeletal muscles are larger than smooth muscle cells (one muscle cell can be up to 100µm in length). They are also multinucleated whilst smooth muscle cells are uninucleate (Alberts et al, 2002: 961). Additionally, skeletal muscle cells appear to be striated, whereas smooth muscle cells do not show this banding pattern; but are instead smooth and tapered. The absence of this patterning in smooth muscle cells suggests that they consist of a less organised collection of contractile fibres (Silverthorn, 2007: 397). This banding pattern in skeletal muscles is known as the sarcomere.
at Ian in Terry and Ian's house but the stage had still been kept as
It has often been said that hair weaves are typically thought to be used by African Americans. Weaving is a technique that consist of sewing artificial or human hair that has been sewn onto a weft onto braids or a weaving net. A weaving net helps to protect your hair from damage caused by the tension of the thread while pulling it to secure the wefts.
of the eye, this is what gives form to the eyeball. The vascular tunic has three
Wistow, G. J., and J. Piatigorsky. 1988. Lens crystallins: the evolution and expression of proteins for a highly specialized tissue. Annu. Rev. Biochem. 57: 479-504.
“Fibroblast responses to variation in soft tissue mobilization pressure.” Medicine and Science in Sports and Exercise. April 1999: 531-5. Hargrove, Eugene C., ed. Animal Rights/Environmental Ethics Debate, Inc. Environmental Perspective.