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How does the collagen structure of hypertrophic scars differ from that of keloids?
Hypertrophic scars have an overproduction of collagen that remains within the boundaries of the original wound, resulting in raised, red scars. Keloids, on the other hand, have an excessive production of collagen that extends beyond the original wound site, leading to smooth, shiny, and raised scars that can grow larger than the original injury.
The site of origin of the preganglionic fibers of the parasympathetic nervous system is?
brain stem and the sacral region of the cord
Where are sharpey's fibers found?
Sharpey's fibers are found at the junction between tendons, ligaments, or joint capsules and bone, where they anchor these structures to the bone. They are primarily composed of dense collagen fibers that penetrate into the bone matrix, providing strength and stability to the attachment site.
What protein is involved in formation of scar tissue?
Fibroblasts are the main cells involved in the formation of scar tissue. They produce collagen, a type of protein that helps repair and strengthen damaged tissue, ultimately leading to scar formation. Fibroblasts migrate to the injury site and lay down collagen fibers to remodel the damaged area.
What joins arms together and is the place where spindle fibers attach to each chromosome?
The sister chromatids (arms) are held together by centromeres. Centromeres are the site of attachment for the spindle fibers.
Synapse site for afferent fibers to sensory cortex?
Thalamus
What is the attachment site of spindle fibers on the chromatids?
kinetochore
What is a myosepta?
Myosepta is the segment in between the myotomes (muscle segments) of a fish. It is the site where the myotomes attach, and is composed of collagen, which is the main connective tissue in fishes. The collagen is arranged in a grid-like formation which gives it the ability to get bent laterally but not longitudinally. This gives the fish the ability to move its body from side to side. Because the collagen is a fairly rigid substance, lateral bended collagen will tend to get unbent. This action is thought to lead to the fish having to spend less energy moving to the other side, because of the drag from the collagen.
When is collagen laid down in an injury site?
Collagen is laid down during the proliferative phase of wound healing, typically starting around 3-5 days after the injury. At this stage, fibroblasts secrete collagen to rebuild the damaged tissue and provide structural support to the healing wound.
Definition of bone?
Bone is a hard, dense connective tissue that makes up the skeletal system of vertebrates. It provides structure, support, and protection for the body, as well as serving as a site for blood cell production and mineral storage. Bones are made up of cells, collagen fibers, and mineral deposits such as calcium and phosphorus.
What is an important synapse site for afferent fibers traveling to the sensory cortex?
The thalamus.
To which part of the centromere do mitotic spindle fibers attach during prometaphase?
The centromeres of chromosomes attach to the spindle fibers during metaphase. The spindle fibers bring about the separation of sister chromosomes to the opposite poles. When spindle fibers do not attach to the centromeres, the doubling of chromosomes leads to polyploidy in the cell.
