Correct Answer: A

Rationale: Hormones play various roles in the body, such as promoting growth and beauty, maintaining body temperature, and fighting infections. However, producing new offspring is not a direct function of hormones. Reproduction is primarily regulated by other factors like the reproductive system. Choice B is incorrect because hormones can indeed influence growth but not specifically 'beauty.' Choice C is incorrect as hormones can help regulate body temperature indirectly. Choice D is incorrect as hormones like cytokines can be involved in the body's immune response to fight infections.

Correct Answer: B

Rationale: The correct answer is B. Increased urine output is not a warning sign of dehydration; it typically decreases with dehydration. Dehydration often presents with poor skin turgor, tachycardia, and an increased sensation of thirst (eager to drink) as the body tries to compensate for fluid loss. Choices A, C, and D are all correct warning signs of dehydration. Poor skin turgor is a result of decreased skin elasticity due to fluid loss. Tachycardia, an elevated heart rate, can be a compensatory mechanism to maintain cardiac output in dehydration. Feeling eager to drink is a common symptom of dehydration as the body attempts to restore fluid balance.

Correct Answer: A

Rationale: Keeping the umbilical cord dry and exposed to air is the correct instruction because it promotes faster healing. Moisture can delay the healing process and increase the risk of infection. Cleaning the cord with alcohol at every diaper change or covering it with a sterile dressing can actually impede the healing process by preventing airflow. Submerging the cord in water during baths is not recommended as it can introduce moisture and increase the risk of infection.

Correct Answer: B

Rationale: The correct answer is B. If a new mother observes that her baby has six to eight wet diapers a day, it indicates that the baby is getting enough breast milk. This is a crucial indicator of adequate milk intake and hydration in infants. Conversely, choices A, C, and D are incorrect. A baby sleeping through the night, crying frequently, or being awake and alert are not reliable indicators of sufficient breast milk intake. It is essential for new mothers to track their baby's diaper output to ensure they are receiving the necessary nutrition.

Correct Answer: B

Rationale: The correct answer is B. Vitamin K is administered to newborns to prevent bleeding disorders since they have low levels of vitamin K, which is essential for blood clotting. By providing this injection, the nurse ensures that the newborn has an adequate supply of vitamin K to support proper blood clotting and prevent potential bleeding complications. Choices A, C, and D are incorrect because vitamin K's primary role in newborns is related to blood clotting and preventing bleeding, not liver function, immune system, or growth and development.