What is the primary role of sweat glands?

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: 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.

Correct Answer: D

Rationale: False ribs (8-10) attach indirectly via shared cartilage, and floating ribs (11-12) don't attach to the sternum, unlike true ribs (1-7, direct). Both 'b' and 'c' fit false and floating lack direct connection. This distinction, per rib anatomy, makes 'd' correct.

Correct Answer: A

Rationale: The cell is the smallest independently functioning unit of life, capable of metabolism, reproduction, and homeostasis (e.g., a neuron firing), per cell theory. Molecules like DNA or proteins are components, not independently functional. Organs like the heart are multi-tissue structures, far larger. Tissues like muscle are cell groups, not individual units. The cell's standalone vitality, foundational in biology, makes 'a' the correct answer.

Correct Answer: C

Rationale: The heat-loss center (hypothalamus) activates sweat glands to increase output, cooling via evaporation when overheated. Blood vessels dilate (not constrict, a) to release heat. Breathing may adjust but isn't slow/shallow primarily. Not all only 'c' fits. Sweating's cooling role, per thermoregulation, makes 'c' correct.