Which layer of skin is composed mainly of adipose tissue?

Correct Answer: C

Rationale: The hypodermis, or subcutaneous layer, is mainly adipose tissue, storing fat for insulation and energy, cushioning underlying structures. Epidermis is epithelial, dermis is connective with glands/vessels, and stratum granulosum is an epidermal sublayer, none fat-dominated. Hypodermis's fat content, per skin structure, makes 'c' correct.

Correct Answer: A

Rationale: Sutures are immovable, fibrous joints connecting skull bones (e.g., coronal), locking them post-growth. Fontanels are infant soft spots, closing to sutures. Joint is broad, but suture is specific. Ligaments connect bones elsewhere. Sutures' cranial role, per anatomy, makes 'a' correct.

Correct Answer: B

Rationale: The sternum connects ribs via costal cartilage, supporting the thoracic cavity and protecting heart/lungs. Spinal cord is vertebral, breathing is secondary (diaphragm-driven), skull support is cranial. Sternum's thoracic role, per anatomy, makes 'b' correct.

Correct Answer: A

Rationale: An exercise physiologist studies how the body functions during physical activity, like a marathon, focusing on metabolism, hydration, and energy use perfect for analyzing food/fluid utilization. A microscopic anatomist examines cellular structures, not whole-body processes. Regional physiologist isn't a standard term; physiology isn't typically region-specific here. Systemic anatomist studies structural systems, not dynamic function. Exercise physiology's emphasis on performance and metabolism, per scientific roles, makes 'a' correct.

Correct Answer: A

Rationale: Nerve cells (sensors) detect stomach distension and relay it to a control center (e.g., brainstem) in a feedback loop to process and respond (e.g., digestion adjustment). A set point is a target value, not a receiver. Effectors act (e.g., muscles), not receive. Sensors detect, not receive relayed data. Control center's role, per homeostasis, makes 'a' correct.