Answer :
Final answer:
Osteoporosis, Paget's Disease, and Osteogenesis Imperfecta are three degenerative bone diseases characterized by porous and brittle bones. While Osteoporosis is age-related, Paget's Disease involves a disruption in bone absorption and formation, and Osteogenesis Imperfecta is a genetic disorder present from birth.
Explanation:
A degenerative bone disease characterized by porous bones is called Osteoporosis. It is an age-related disorder that causes the gradual loss of bone density and strength, making the bones fragile, porous, and brittle. When bones lose their density, they become more prone to fractures, often affecting the vertebrae and resulting in kyphosis, a curvature of the spine.
Another disorder called Paget's Disease also results in porous and weak bones due to a disruption in the bone remodeling process which begins with overactive osteoclasts, cells that absorb bone tissue. This results in more bone being absorbed than is being created. This leads to abnormally weak and brittle bones that are prone to fractures and deformities.
Lastly, Osteogenesis Imperfecta (OI), also known as brittle bone disease, is a genetic disorder in which bones do not form properly from birth, leading to fragile and easily breakable bones.
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