Collagen is secreted by fibroblasts. Some type of collagen are also secreted by epithelial cells. There are different types of collagen in the body.
Collagen is the most abundant protein in the body and a key components of all connective tissues. It provides the infrastructure of the muscoskeletal system which are essential for mobility.
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Answer:
True and The respiratory system is a biological system consisting of specific organs and structures used for gas exchange in animals and plants
Elastic and gravitational
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