Which hormone is responsible for regulating water reabsorption in the kidneys?

A. Touch: Touch is a general sense detected by mechanoreceptors distributed throughout the body. It provides information about pressure, vibration, and texture, and does not require specialized organs.

B. Smell: Smell is a special sense mediated by olfactory receptors in the nasal cavity, requiring a specialized organ for detection.

C. Hearing: Hearing is a special sense detected by the cochlea in the inner ear, which is specialized for auditory perception.

D. Vision: Vision is a special sense mediated by photoreceptors in the retina of the eyes, requiring a highly specialized organ.

A. To filter blood and form urine: The kidneys filter blood to remove metabolic wastes, excess electrolytes, and water, producing urine. They also play a key role in regulating blood volume, blood pressure, and maintaining electrolyte and acid-base balance in the body.

B. To produce bile: Bile is a digestive fluid produced by the liver that emulsifies fats in the small intestine. The kidneys do not participate in digestion or bile production but focus on waste elimination and homeostasis.

C. To regulate heart rate: Heart rate is controlled by the autonomic nervous system and the pacemaker activity of the sinoatrial node in the heart. The kidneys can indirectly influence heart rate through blood pressure regulation, but they do not directly control cardiac rhythm.

D. To digest food: Digestion involves the breakdown of nutrients in the gastrointestinal tract through mechanical and chemical processes. The kidneys are involved in filtration, excretion, and homeostasis rather than digestion.