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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?
A centromere is the region of a chromosome where spindle fibers attach during cell division. It is responsible for joining the two sister chromatids together.
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?
A myosepta is a connective tissue structure found in fish that separates adjacent myomeres (bundles of muscle fibers) along the body. It provides support and helps transmit forces generated during swimming movements.
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.
To which part of the centromere do mitotic spindle fibers attach during prometaphase?
Mitotic spindle fibers attach to the kinetochore region of the centromere during prometaphase. The kinetochore is a protein structure on the centromere that serves as the attachment site for spindle fibers, allowing for the movement of chromosomes during mitosis.
What is an important synapse site for afferent fibers traveling to the sensory cortex?
The thalamus.
