What is the largest part of the human brain?

Correct Answer: C

Rationale: The cerebrum, occupying the upper cranial cavity, is the human brain's largest part, comprising about 80% of its mass. Located above the brainstem and cerebellum, it handles higher functions thinking, memory, and voluntary movement via its cerebral cortex, divided into four lobes: frontal (problem-solving), parietal (sensation), temporal (auditory processing), and occipital (vision). Its size and convoluted surface, with gyri and sulci, maximize neuron density, supporting complex cognition unique to humans. The midbrain, a small brainstem segment, relays sensory and motor signals but is far smaller. The medulla oblongata, also brainstem, regulates vital functions like breathing but is compact. The cerebellum, below the cerebrum, coordinates movement and balance, yet its volume is less than the cerebrum's. Neuroanatomy studies quantify the cerebrum's dominance around 1,300-1,400 grams in adults dwarfing other regions, underscoring its evolutionary expansion for intelligence and adaptability, distinct from smaller, specialized structures.

Correct Answer: A

Rationale: First-degree burns affect only the epidermis, causing redness and pain (e.g., sunburn), without deeper damage. Second-degree reaches the dermis, blistering. Third-degree destroys both layers, numbing nerves. Fourth-degree extends to muscle/bone, rare. Epidermal-only involvement, per burn classification, makes 'a' correct.

Correct Answer: B

Rationale: A compound (open) fracture breaks through the skin, exposing bone, risking infection (e.g., tibia piercing). Simple stays internal. Stress is microdamage from overuse. Greenstick bends, common in kids. Compound's external breach, per trauma classification, makes 'b' correct.

Correct Answer: D

Rationale: Ribs (1-12) include true (1-7, direct sternal attachment) and false (8-12, indirect or none), forming the cage. Sternum connects ribs, thoracic vertebrae anchor them, costal cartilage links true ribs none encompass both types. Ribs' classification, per thorax, makes 'd' correct.

Correct Answer: B

Rationale: The knee joint, or femorotibial joint, is between the femur and tibia, a hinge for leg movement. Humeroulnar is elbow, coxofemoral is hip, talocrural is ankle. Femorotibial's specificity, per joint nomenclature, makes 'b' correct.