Which is a function of the musculoskeletal system? Select all that apply.

A. "Are you taking iron supplements?": Exogenous iron intake can cause a non-pathological darkening of the stool, which is a common side effect of supplementation. While this provides a potential benign explanation, the nurse must first rule out a life-threatening hemorrhage. This question is secondary to determining the physical characteristics of the stool.

B. "How frequent are the stools?": Frequency helps determine the severity of diarrhea or constipation but does not help differentiate between types of gastrointestinal bleeding. It provides data on bowel habits rather than the etiology of the abnormal color. The nurse's priority is to identify the presence of digested blood.

C. "Are others in your family similarly affected?": This question assesses for infectious etiologies or shared dietary exposures, which are less likely to present as isolated black stools. It does not provide immediate diagnostic information regarding the patient's current clinical stability. It is a lower-priority question during the initial assessment of melena.

D. "Is the consistency tarry (tar-like)?": Tarry, sticky, and foul-smelling black stools (melena) indicate an upper gastrointestinal bleed where blood has been digested by gastric acid. Non-tarry black stools are often caused by medications or diet. Establishing the consistency is the most critical step in identifying a potential medical emergency.

A. Iliac crest: Asymmetry of the iliac crests often suggests a pelvic tilt associated with a lateral spinal curvature or leg-length discrepancy. During a scoliosis screening, the nurse observes the waistline for unevenness that may indicate a compensatory pelvic shift. It is a primary landmark for identifying truncal imbalance.

B. Temporomandibular joint: This joint facilitates mandibular movement for mastication and speech and is located in the facial skeleton. Its alignment is unrelated to the structural integrity or curvature of the vertebral column. Asymmetry here would suggest a dental or maxillofacial issue rather than scoliosis.

C. Interphalangeal joint: These joints are located within the fingers and are involved in fine motor tasks and grip. Their alignment has no clinical relevance to the assessment of spinal symmetry or the detection of adolescent idiopathic scoliosis. They are distant from the axial skeleton and its associated postural landmarks.

D. Scapula: An uneven or "winging" scapula is a classic sign of scoliosis, indicating a rib hump caused by vertebral rotation. When the student performs the Adam's Forward Bend Test, one shoulder blade may appear higher or more prominent than the other. This is a critical indicator of a three-dimensional spinal deformity.

E. Acromion process: Shoulder height inequality, observed at the acromion process, is often the first visible sign of an underlying spinal curve. One shoulder appearing higher than the other at rest suggests that the thoracic spine is not properly aligned. It is a standard anatomical reference point in postural screenings.