Which structure is primarily responsible for gas exchange in the lungs?

• Trachea

• Alveoli

• Bronchi

• Pleura

What is the main muscle involved in the process of inhalation?

• Diaphragm

• Intercostal muscles

• Abdominal muscles

• Pectoralis major

Which blood vessel carries oxygenated blood from the lungs to the heart?

• Pulmonary artery

• Pulmonary vein

• Aorta

• Superior vena cava

Which of the following is a common chronic respiratory disease characterized by airway inflammation and hyperresponsiveness?

• Asthma

• Tuberculosis

• Pneumonia

• Lung cancer

What is the primary function of the epiglottis in the respiratory system?

• Produces mucus

• Prevents food from entering the trachea

• Warms and humidifies air

• Facilitates gas exchange

Which of the following best describes the process of external respiration?

• Exchange of gases between blood and tissues

• Exchange of gases between alveoli and blood

• Cellular use of oxygen to produce energy

• Movement of air into and out of the lungs

Which structure divides the right and left lungs?

• Diaphragm

• Mediastinum

• Pleural cavity

• Bronchus

Which of the following is a symptom commonly associated with chronic obstructive pulmonary disease (COPD)?

• Sudden chest pain

• Persistent cough with sputum

• High fever

• Swollen lymph nodes

Which part of the respiratory system listed bellow is lined with ciliated pseudostratified columnar epithelium?

• Alveoli

• Trachea

• Diaphragm

• Pleura

Which of the following best describes the role of surfactant in the lungs?

• Increases airway resistance

• Reduces surface tension in alveoli

• Promotes mucus production

• Enhances oxygen binding to hemoglobin