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Lungs sheep

Q: Why is it so hard to inflate the lungs of a dead animal?

-It is very hard to overcome the first resistance of elasticity, because the lungs are much smaller than normal

Q: Why is bronchial system often surrounded by much BALT tissue?

- There is only a single cell layer seperating the blood stream from the outside world - As the air we inhale is not sterile there has to be a strong immune surveillance - The bronchio-associated-lymphoid tissue (BALT) contains a vast amount of immune cells

Q: What is the function of the cartilage rings in the tracheal wall?

- structural strength -> to prevent the collapse of the tracheal tubes escpecially during coughing en sneezing + to withstand the pressure from outside - The rings are not closed and the diameter of the rings is adjustable for when there is a higher demand for oxygen - crocodiles have closed rings -> they eat very large prey and otherwise their food would close off their airways

3 important questions on Lungs sheep

Why is it so hard to inflate the lungs of a dead animal?

-It is very hard to overcome the first resistance of elasticity, because the lungs are much smaller than normal

Why is bronchial system often surrounded by much BALT tissue?

- There is only a single cell layer seperating the blood stream from the outside world
- As the air we inhale is not sterile there has to be a strong immune surveillance
- The bronchio-associated-lymphoid tissue (BALT) contains a vast amount of immune cells

What is the function of the cartilage rings in the tracheal wall?

- structural strength -> to prevent the collapse of the tracheal tubes escpecially during coughing en sneezing + to withstand the pressure from outside
- The rings are not closed and the diameter of the rings is adjustable for when there is a higher demand for oxygen
- crocodiles have closed rings -> they eat very large prey and otherwise their food would close off their airways