The ductus arteriosus is another fetal structure that is important in the intrauterine life. It functions to:

Correct Answer: B

Rationale: The ductus arteriosus is a fetal blood vessel that connects the pulmonary artery to the aorta. Its main function is to bypass the non-functional fetal lungs by shunting blood from the pulmonary artery (which carries deoxygenated blood) directly to the systemic circulation, specifically the aorta. This allows oxygenated blood from the placenta to be distributed to the body's organs and tissues without having to first pass through the lungs for oxygen exchange. After birth, when the baby begins to breathe and oxygenate its blood through the lungs, the ductus arteriosus normally closes within the first few days to weeks of life.

Correct Answer: C

Rationale: The food pyramid can help guide the client on his diet by suggesting daily food choices. The food pyramid categorizes different food groups based on their nutritional compositions and recommended daily servings. By following the food pyramid, the client can make informed choices about what types and amounts of food to consume each day to achieve a balanced and healthy diet. The visual representation of the food pyramid also helps in understanding the relative proportions of different food groups that are part of a nutritious diet.

Correct Answer: A

Rationale: The sympathetic nervous system is responsible for the body's "fight or flight" response. Tachycardia (increased heart rate) and dilated pupils are classic responses of the sympathetic nervous system activation during times of stress or danger. These physiological responses prepare the body for action, such as running away from a threat.

Correct Answer: A

Rationale: The sympathetic nervous system saves fluid in response to the stress of surgery, leading to the urine becoming dark amber and concentrated. During stressful events such as surgery, the body activates the sympathetic nervous system as part of the fight-or-flight response. One of the functions of the sympathetic nervous system in this situation is to conserve fluids in the body by reducing urine output. This results in more concentrated urine, often appearing dark amber in color. Conversely, the parasympathetic nervous system is not typically involved in conserving fluid during stress responses.

Correct Answer: C

Rationale: The described reflex involving stroking the newborn's cheek along the side of the mouth causing the newborn to turn the head toward that side and begin to suck is known as the rooting reflex. This reflex is essential for newborns to find the nipple and start breastfeeding. Stroking the cheek triggers the baby to turn towards the stimulus, helping them locate the source of food for feeding.

Correct Answer: D

Rationale: The statement that best describes the clinical manifestations of the preterm newborn is that the extremities remain in an attitude of flexion. This characteristic is known as the "fetal position" and is commonly observed in preterm infants due to their premature musculoskeletal development. The flexed position of the extremities is a result of the baby's position in the uterus and is a normal finding for preterm newborns. Other clinical manifestations of preterm newborns may include a disproportionately large head in relation to the body, an immature or weak sucking reflex, and decreased thermostability due to their underdeveloped thermoregulatory systems.

Correct Answer: D

Rationale: A herniated nucleus pulposus at the C4-C5 and C5-C6 interspace typically results in neck and shoulder pain, which can radiate to the scapular region. The herniation at these levels can cause irritation or compression of the cervical nerve roots leading to pain, numbness, tingling, or weakness in the affected areas. Constant, throbbing headaches are not typically associated with this specific diagnosis. Clonus in the lower extremities and numbness of the face are also not common findings related to herniated nucleus pulposus at the cervical spine levels mentioned.

Correct Answer: C

Rationale: The nursing care for a client in Addisonian crisis, also known as adrenal crisis, should include offering extra blankets and raising the heat in the room to keep the client warm. Addisonian crisis is a life-threatening condition that occurs when the body does not have enough cortisol and aldosterone, which are hormones produced by the adrenal glands. Symptoms of Addisonian crisis include severe weakness, fatigue, abdominal pain, nausea, vomiting, and low blood pressure. By offering extra blankets and raising the room temperature, the nurse can help prevent hypothermia, which can worsen the client's condition. It is important to maintain the client's body temperature to promote comfort and prevent further complications during Addisonian crisis.

Correct Answer: B

Rationale: Peer interactions are crucial during adolescence; having friends visit helps him feel connected and 'normal.'