summary of unit humon bones lesson my big brother
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Explanation: The wider section at each end of the bone is called the epiphysis (plural = epiphyses), which is filled with spongy bone. Red marrow fills the spaces in the spongy bone. Each epiphysis meets the diaphysis at the metaphysis, the narrow area that contains the epiphyseal plate (growth plate), a layer of hyaline (transparent) cartilage in a growing bone. When the bone stops growing in early adulthood (approximately 18–21 years), the cartilage is replaced by osseous tissue and the epiphyseal plate becomes an epiphyseal line.
The medullary cavity has a delicate membranous lining called the endosteum (end- = “inside”; oste- = “bone”), where bone growth, repair, and remodeling occur. The outer surface of the bone is covered with a fibrous membrane called the periosteum (peri- = “around” or “surrounding”). The periosteum contains blood vessels, nerves, and lymphatic vessels that nourish compact bone. Tendons and ligaments also attach to bones at the periosteum. The periosteum covers the entire outer surface except where the epiphyses meet other bones to form joints ([link]). In this region, the epiphyses are covered with articular cartilage, a thin layer of cartilage that reduces friction and acts as a shock absorber.
The big brother is a story written by Munshi Premchand.In this story,there are two brothers.The elder brother is
five years elder to the younger brother.The elder one is hard-working while the younger one is naughty and hardly studied.Due to badluck the elder brother fails twice while younger one tops twice.This makes the younger one feel proudly.One day the elder brother saves the younger brother from falling down and days that I will always be your elder brother no matter how many times I fail.Moral is that our elders deserve to be respected whether they are successful or not
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