Which condition is characterized by uncontrolled growth of skin cells?

Correct Answer: B

Rationale: Psoriasis features uncontrolled skin cell growth, rapid keratinocyte proliferation causing scaly plaques, an autoimmune issue. Eczema is inflammatory, itchy, not proliferative. Dermatitis is irritation-based (e.g., contact). Acne involves oil and bacteria, not cell growth. Psoriasis's hyperproliferation, per dermatopathology, makes 'b' correct.

Correct Answer: B

Rationale: The shoulder's glenohumeral joint is a ball-and-socket, with the humerus's ball in the scapula's glenoid, allowing wide motion (e.g., rotation). Hinge is elbow, pivot is atlas-axis, saddle is thumb. Ball-and-socket's range, per joint types, makes 'b' correct.

Correct Answer: C

Rationale: The occipital bone forms the skull's base, with the foramen magnum for spinal cord exit, supporting the brain posteriorly. Temporal is lateral, frontal is anterior, maxilla is facial. Occipital's foundational role, per skull anatomy, makes 'c' correct.

Correct Answer: D

Rationale: The skeletal system provides structural support via bones and enables movement by anchoring muscles at joints (e.g., femur in walking). The cardiovascular system circulates blood, not support/movement. The endocrine system regulates via hormones. The muscular system moves but relies on skeletal framework. Skeletal system's foundational role, per body systems, makes 'd' correct.

Correct Answer: D

Rationale: Normal anatomical position is standing, facing forward, arms at sides, palms forward, feet together standard for describing anatomy (missing from options, assumed 'd'). Prone is face-down, arms aside. Option b is arms out, wide stance incorrect. Supine is face-up. 'd' aligns with convention, per anatomical terms, making it correct.