Which of the following terms refers to the loss of bone density?

The term that refers to the loss of bone density is osteoporosis. This condition is characterized by a decrease in bone strength, which increases the risk of fractures and breaks. As bones lose density, they become more porous and fragile, making it more likely for individuals to experience injuries even with minor falls or impacts. Osteoporosis is particularly common in older adults, especially postmenopausal women, due to hormonal changes that can accelerate bone loss.

While arthritis, fibromyalgia, and rheumatism are related to pain and discomfort in the musculoskeletal system, they do not specifically involve the loss of bone density. Arthritis primarily involves inflammation of the joints, fibromyalgia is characterized by widespread musculoskeletal pain, and rheumatism refers to various conditions affecting the joints and connective tissues. None of these conditions focus on the density or strength of bones like osteoporosis does.