Final answer:
Muscle weakness is an intrinsic factor in falls among the elderly, which is exacerbated by conditions like osteoporosis. Proper exercise, nutrition, and an active lifestyle can help minimize muscle strength decline and maintain bone density.
Step-by-step explanation:
Among the options provided, muscle weakness is an intrinsic factor contributing to falls in the elderly. Intrinsic factors are those that come from within the individual, as opposed to extrinsic factors which are related to the external environment. As people age, they may experience various physical declines including muscle weakness, which can result in difficulties with movement, coordination, and balance.
Conditions such as osteoporosis can further exacerbate the issue, leading to skeletal weakness and increased risk of fractures from falls. It is important to note that a well-rounded approach including proper exercise, nutrition, and an active lifestyle can help minimize these declines in muscle strength and bone density.