Final answer:
True, pressure ulcers can involve muscles, tendons, and bones, as they occur due to prolonged pressure that causes tissue damage, potentially affecting deeper layers if not treated early.
Step-by-step explanation:
Pressure ulcers can indeed involve not only the skin but also the underlying muscles, tendons, and bones. This is true because pressure ulcers, also known as bedsores or decubitus ulcers, occur due to prolonged pressure on specific parts of the body, leading to impaired blood flow and subsequent tissue necrosis. When these sores progress without proper treatment, they can extend into deeper layers, affecting muscles, tendons, and even bones. This makes the prevention and early treatment of bedsores critical, especially in patients who are bedridden or have limited mobility.