Correct Answer: A

Rationale: Plasma cells are the primary type of cells responsible for the production of antibodies during the humoral immune response. When activated by antigens, B cells differentiate into plasma cells, which are specialized in producing large quantities of antibodies. These antibodies are essential in fighting off infections by binding to antigens and marking them for destruction by other immune cells. T helper cells assist in activating B cells, but the actual production of antibodies is mainly carried out by plasma cells. Memory B cells are involved in mounting a rapid and specific secondary response upon re-exposure to the same antigen. Macrophages play a role in phagocytosis and antigen presentation, but they are not the primary cells responsible for producing antibodies during the humoral immune response.

Correct Answer: D

Rationale: The correct action to prioritize during the initial assessment when preparing to assist with a cardiopulmonary resuscitation (CPR) procedure for a patient in cardiac arrest is to assess the patient's airway, breathing, and circulation (ABCs). This involves quickly checking the patient's airway for any obstructions, assessing their breathing for signs of breathing difficulties or absence of breathing, and evaluating their circulation by checking for a pulse. This step is crucial in determining the need for immediate intervention, such as clearing the airway, providing rescue breaths, or initiating chest compressions. By prioritizing the assessment of the ABCs, the nurse can promptly identify and address life-threatening issues to improve the patient's chances of survival during a cardiac arrest situation.

Correct Answer: A

Rationale: Transient ischemic attack (TIA) is a temporary episode of neurological dysfunction caused by a temporary disruption in blood supply to the brain. The symptoms of a TIA typically last for a short period of time, usually less than 1 hour. In some cases, the symptoms may last up to 24 hours but generally resolve within a shorter time frame. It is important for healthcare providers to recognize the symptoms of a TIA promptly and assess the patient for appropriate management to prevent the risk of a full-blown stroke.

Correct Answer: B

Rationale: In the situation of an obstetric emergency requiring immediate delivery, the priority nursing action is to prepare the delivery room for the birth. This involves ensuring that all necessary supplies and equipment are readily available, the bed is adjusted to the appropriate position, and the healthcare team is prepared to assist with the birth. By expeditiously preparing the delivery room, the healthcare team can facilitate a safe and timely delivery for both the mother and the baby. Notifications to the healthcare provider, administering intravenous fluids, and continuous fetal monitoring can be done simultaneously but preparing the delivery room takes precedence to ensure a prompt response to the emergent situation.

Correct Answer: C

Rationale: Feces, urine, blood, and other body fluids are considered as vehicles of transmission in the context of communicable diseases. These substances can carry and transmit disease-causing microorganisms such as bacteria, viruses, and parasites from infected individuals to others. Through close contact or exposure to these contaminated body fluids, the pathogens can enter the body of another person and cause infection. Nurses like Nurse Keena must exercise caution and use appropriate infection control measures to prevent transmission of communicable diseases through these vehicles.