Which is the widest part of the radius?

Correct Answer: B

Rationale: The distal radius, near the wrist, is the widest part, flaring to form the distal radioulnar joint and wrist articulation with carpals, supporting hand movement. The proximal end , near the elbow, is narrower, with the radial head. Medial and lateral describe sides, not width, but the distal end's breadth exceeds others. Its expanded distal structure, visible in forearm X-rays, makes 'b' the correct answer.

Correct Answer: B

Rationale: Stratified squamous epithelium lines the esophagus, a multi-layered, tough tissue protecting against abrasion from food passage, non-keratinized to stay moist. Simple cuboidal is for secretion/absorption (e.g., glands), not protection here. Simple columnar suits secretion in the stomach, not esophageal wear. Transitional stretches in the bladder, not relevant. Stratified squamous's durability, per digestive tract anatomy, makes 'b' the correct type.

Correct Answer: B

Rationale: Sweat glands, primarily eccrine, regulate body temperature (thermoregulation) by secreting sweat to cool via evaporation, a key homeostasis mechanism. Protection is secondary (e.g., flushing pathogens). Sensory reception involves nerves, not glands. Hormonal secretion is endocrine, not sweat-related. Thermoregulation's primacy, per skin physiology, makes 'b' correct.

Correct Answer: C

Rationale: The epiphyseal plate, a cartilage layer in growing long bones, allows longitudinal growth as chondrocytes divide, ossify, and lengthen the bone until maturity. Remodeling occurs throughout bone. New formation is broader, not plate-specific. Its growth function, per skeletal development, makes 'c' correct.

Correct Answer: B

Rationale: The nasal septum is formed by nasal bones (upper) and vomer (lower), dividing nostrils midline. Maxilla/mandible frame the mouth. Frontal/parietal are cranial. Temporal/sphenoid are lateral/base. Nasal/vomer's septal role, per facial anatomy, makes 'b' correct.