The musculoskeletal system provides the framework and machinery for protection, support, and movement. Bones, joints, and skeletal muscles work together to form a sturdy structure that supports the body's shape and posture. The bones shield vital organs—like the skull protecting the brain and the rib cage guarding the heart and lungs—while the spinal column protects the spinal cord. The skeleton also serves as a rigid framework that supports soft tissues and provides attachment points for muscles and ligaments. Movement arises when muscles contract and pull on bones via tendons, with joints acting as the pivots that allow different types of motion. The bones function as levers, changing the direction and range of movement produced by muscle forces. Although the nervous system coordinates and modulates these actions, the actual protection, support, and movement come from the musculoskeletal structures themselves. In nursing practice, disruptions to this system—from fractures to muscle weakness—directly impact mobility, stability, and safety, guiding interventions like fall prevention, assistive devices, and rehabilitation to restore function.

Understanding the usual reference for a healthy adult’s temperature helps you gauge what’s normal. The value most often cited as the average normal body temperature is 98.6°F (37°C). This serves as a standard reference, though real readings vary from person to person and depend on how you measure it. For oral measurements, many healthy adults are near this value, with a normal range roughly from 97.6°F to 99.6°F. So 98.6°F is the best answer as the typical average. A reading around 99.0°F can be normal for some individuals or at certain times, but it isn’t the standard average. A reading of 97.6°F is within normal limits but represents the lower end of the spectrum. A reading of 100.4°F is generally considered fever, suggesting a potential illness.

High-pitched, musical, squeaking adventitious lung sounds are wheezes. They occur when air flows through narrowed or obstructed airways, causing turbulent, whistle-like sound transmission, often heard during expiration in conditions like asthma or bronchospasm. The other terms don’t describe a lung sound: a biohazard is a safety concern, hypotension is low blood pressure, and tachypnea means rapid breathing without reference to a sound produced.

In nursing, this question tests knowledge of body position terminology. Prone means lying on the abdomen with the face downward. This contrasts with the supine position, where a person lies on the back facing upward; the lateral position involves lying on one side; and Fowler's position is a semi-sitting pose with the head and chest elevated. Understanding these terms helps you describe how a patient is positioned for exams, procedures, or comfort, and knowing the distinctions clarifies which posture matches “face downward on the abdomen.”