Nokea
Which of the ff causes memory cells to convert to plasma cells?
- A. An organ transplant
- B. Re-exposure to a specific antigen
- C. Release of lymphokines
- D. Initial exposure to an antigen
Correct Answer: B
Rationale: Memory cells are a type of immune cell that "remembers" a specific antigen through previous exposure. When the body encounters the same antigen again during a re-exposure, the memory cells quickly recognize it and can rapidly convert into effector cells, such as plasma cells. Plasma cells are specialized cells that produce antibodies targeted against that specific antigen. This rapid conversion process allows the immune system to mount a quicker and more effective response upon encountering the antigen for the second time.
You may also like to solve these questions
The MOST common cause of obstructive sleep apnea in children is
- A. obesity
- B. allergies
- C. adenotonsillar hypertrophy
- D. pharyngeal reactive edema due to gastroesophageal reflux
Correct Answer: C
Rationale: Adenotonsillar hypertrophy is the leading cause of obstructive sleep apnea in children.
All the following are compatible with the definition of obstructive sleep apnea EXCEPT
- A. episodes of prolonged upper airway obstruction
- B. repeated apnea
- C. 230% reduction in airflow
- D. 2-30% O2 desaturation
Correct Answer: D
Rationale: Oxygen desaturation of 2-30% is too low to define mild-to-moderate sleep apnea.
Which following parameters correlates best with measurements of the body's total protein stores?
- A. Height
- B. Weight
- C. Skinfold thickness
- D. Upper arm circumference
Correct Answer: D
Rationale: Upper arm circumference has been found to correlate best with measurements of the body's total protein stores. This anthropometric measurement is often used as an indicator of nutritional status, particularly protein reserves such as muscle mass. Skinfold thickness can provide information about body fat levels, while height and weight may not specifically indicate protein stores as accurately as upper arm circumference.
The nurse expects to note an elevated serum glucose level in a client with hyperosmolar hyperglycemic nonketonic syndrome (HHNS). Which other laboratory finding should the nurse anticipate?
- A. Elevated serum acetone level
- B. Serum alkalosis
- C. Serum ketone bodies
- D. Below-normal serum potassium level
Correct Answer: D
Rationale: Hyperosmolar hyperglycemic nonketonic syndrome (HHNS) is characterized by extremely elevated blood glucose levels without significant ketosis. Unlike diabetic ketoacidosis (DKA), patients with HHNS usually do not have high levels of ketone bodies in their blood or urine. Therefore, the nurse should anticipate below-normal serum potassium levels in a client with HHNS, as hyperglycemia can lead to profound potassium losses through osmotic diuresis. Monitoring and treating electrolyte imbalances, including hypokalemia, are crucial in managing HHNS. It is important to correct these imbalances promptly to prevent further complications.
In fetal period, all are true EXCEPT
- A. 10 weeks - midgut returns to abdomen
- B. 12 weeks - external genitalia formed
- C. 24 weeks - surfactant production begun
- D. 26 weeks - face clearly recognizable
Correct Answer: D
Rationale: Face recognition typically occurs earlier than 26 weeks.