Which of the following characteristics of the lungs of infants and small children creates an increased risk of respiratory disorders?
A) Type II alveoli in children may overproduce surfactant.
B) Smaller airways create a susceptibility to changes in airway resistance and airflow.
C) The pneumotaxic center in the pons is underdeveloped until 8 years of age.
D) There are fewer chemoreceptors in the young medulla.
Ans: B
Feedback:
Because the resistance to airflow is inversely related to the fourth power of the radius (resistance = 1/radius), relatively small amounts of mucus secretion, edema, or airway constriction can produce marked changes in airway resistance and airflow. Surfactant production is low early in life, and the respiratory center and chemoreceptors are present and functional in infants and children.
You might also like to view...
Treatment for systemic fungual infections entail risky side effects
Indicate whether the statement is true or false.
Endometriosis is characterized by painful hemorrhagic lesions in the pelvis, which may develop into which of the following potential complications?
A) Pelvic adhesions B) Endometrial cancer C) Candidiasis vaginitis D) Bladder herniation
Bronchodilators are used to treat ___________.
a. symptoms of acute respiratory conditions such as asthma and COPD b. coughing c. allergy symptoms d. upper airway congestion
Meibomian gland dysfunction is found in a significant number of "normal" patients who have no symptoms
a. true b. false