Lung histology

This tutorial covers the histology of the lung, focusing on the lower respiratory tract. It begins with basic concepts, then explores the histology of bronchi, bronchioles, and alveoli. The tutorial also discusses fetal lung development, the pulmonary vasculature, and the bronchial tree. Clinical notes on asthma are provided, highlighting its histological features. The session concludes with a summary of key points.

What is the primary characteristic of lung tissue in histological slides?

• Solid and opaque

• Expanded net over empty space

• Layered and stratified

• Dense and compact

Which structure is characterized by pseudostratified columnar ciliated epithelium?

• Alveoli

• Bronchi

• Terminal bronchioles

• Pulmonary veins

What is a distinguishing feature of bronchioles compared to bronchi?

• Presence of cartilage

• Larger diameter

• Presence of goblet cells

• Lack of cartilage

What type of cells are most common in the terminal bronchioles?

• Macrophages

• Club cells

• Type 2 pneumocytes

• Type 1 pneumocytes

What is the primary function of Type 1 pneumocytes?

• Secrete surfactant

• Gas exchange

• Produce mucus

• Immune defense

Which cells in the alveoli are responsible for secreting surfactant?

• Type 1 pneumocytes

• Type 2 pneumocytes

• Macrophages

• Club cells

What is the role of alveolar macrophages?

• Gas exchange

• Produce mucus

• Secrete surfactant

• Immune defense

What characterizes asthma in terms of airway response?

• Reduced blood flow

• Decreased mucus production

• Hyperresponsiveness to stimuli

• Increased cartilage formation

Which cells are involved in the inflammatory response in asthma?

• Type 1 pneumocytes

• Club cells

• Neutrophils and eosinophils

• Macrophages

What triggers bronchospasm in asthma?

• Increased blood flow

• Decreased mucus production

• Increased cartilage formation

• Release of mediators from mast cells