Lungs & Digestive system

13 important questions on Lungs & Digestive system

What does the arising of the respiratory diverticulum (bud) depend on?

- Retinoic acid produced by mesoderm
- TBX4

What are cartilage, muscle and connective tissue derived from?

Mesoderm or neural crest cells.

What separates the trachea and lung buds from the esophagus?

The tracheoesophageal ridge.
  • Higher grades + faster learning
  • Never study anything twice
  • 100% sure, 100% understanding
Discover Study Smart

What are the five stages of the development of the lungs?

1. Embryonic phase
2. Pseudoglandular period
3. Canalicular
4. Saccular
5. Alveolar

What are the bronchial buds, that develop in the embryonic and pseudoglandular phase?

Invaginations of the foregut.

Where do the bronchial buds expand?

In the pericardioperitoneal canals.

In the pseudoglandular phase, the lungs have cubic epithelial cells. How are they called?

Type II pneumocytes.

What are the most important things that happen in the canalicular phase (until week 28)?

- Epithelium specialization (from type II into type I)
- Canaliculi compose the proper respiratory part of the lungs (pulmonary parynchema).

What are the most important things that develop in the saccular phase?

- Terminal sacs are produced
- Development of gas-exchange
- Type II cells produce surfactant

What happens in the alveolar phase?

- Alveoli become more thin-walled
- Alveoli are mature
- Terminal sacs continue to form (mature age 10)

What is the problem with many premature infants?

They suffer from respiratory distress syndrome (RDS), because they have insufficient surfactant, which causes increased tension, which results in the collapsing of the alveoli

What happens to the amniotic fluids in the lungs, when the child is born?

The fluid is absorbed by the lungs (and the surfactant remains on the surface)

How can the lung maturity be measured?

By taking a sample from the amniotic fluid to see how much surfactant is present

The question on the page originate from the summary of the following study material:

  • A unique study and practice tool
  • Never study anything twice again
  • Get the grades you hope for
  • 100% sure, 100% understanding
Remember faster, study better. Scientifically proven.
Trustpilot Logo