Mechanisms of Lung/Swimbladder Ventialtion

Question 1

What pump is used via lung/swimbladder ventilation?

Answer 1

• buccal

Question 2

Explain the steps of an inhale in lung/swimbladder

Answer 2

• Drop floor of mouth (pressure change)
• air into buccal cavity
• floor of mouth raised (pos. pressure in BC)
• air moves to anterior chamber

Question 3

What is a pneumatic tube?

Answer 3

• connected to esophagus

Question 4

Explain what happens during exhale in lung/swimbladder

Answer 4

• body contraction forces old air out
• posterior chamber –> buccal cavity –> mouth
• body relaxes and new air moves from anterior chamber to posterior chamber

Question 5

Arapaima gigas is an exception to lung/swimbladder breathing. How does it breathe?

Answer 5

• ventilates in lung via aspiration
• arches back and ribs flex outward creating a negative pressure in lungs

Question 6

What is aspiration?

Answer 6

• negative pressure in lung sucks air in (like humans)