Which type of bone tissue is dense and provides strength?

Correct Answer: A

Rationale: Compact bone, dense and cortical, provides strength and rigidity, forming bones' outer layer (e.g., femur shaft). Spongy bone and cancellous are synonymous, porous for marrow, less strong. Cartilage is flexible, not bone. Compact bone's density, per skeletal structure, makes 'a' correct.

Correct Answer: B

Rationale: A herniated disc is a bulging or ruptured intervertebral disc, pressing on spinal nerves, causing pain (e.g., sciatica). It's not a fracture , osteoporosis (c, bone loss), or joint inflammation (d, arthritis). Disc protrusion's effect, per pathology, makes 'b' correct.

Correct Answer: C

Rationale: Regional anatomy studies all structures (bones, muscles, nerves, etc.) within a specific body area, like the ankle and foot, making it ideal for a comprehensive focus on that region's anatomy. Microscopic anatomy examines cells/tissues at a cellular level, not gross structures. Muscle anatomy is too narrow, focusing only on muscles, not all ankle/foot components. Systemic anatomy studies body systems (e.g., skeletal) across the whole body, not one region. Regional anatomy's localized, all-inclusive approach, per anatomical study methods, makes 'c' the correct specialty.

Correct Answer: C

Rationale: In cold, the body breaks down stored energy (e.g., glycogen, fat) via metabolism to generate heat (thermogenesis), maintaining core temperature. Blood to hands/feet decreases (vasoconstriction) to save heat. Lethargy isn't primary shivering is. Blood oxygen doesn't spike, it's steady. Energy breakdown, per thermoregulation, makes 'c' correct.

Correct Answer: C

Rationale: Ultrasounds use sound waves, safe for pregnancy, avoiding radiation risks to the fetus, commonly monitoring development. CT and X-rays emit ionizing radiation, harmful. PET uses radioactive tracers, also risky. Ultrasound's non-invasive safety, per medical practice, makes 'c' correct.