Gas Exchange - Lungfish

Question 1

Do all air breathing fish uses lungs? What would they use instead

Answer 1

No, some use buccal air gulping to swallow air and transport it across the skin and digestive tract where oxygen is absorbed

Question 2

How well-developed are the lungs of lungfish?

Answer 2

Well developed and complex with lots of folds

Question 3

What are the two types of lungfish?

Answer 3

Obligate and facultative

Question 4

What are obligate lungfish?

Answer 4

Need to breathe air periodically

Question 5

What are facultative lungfish?

Answer 5

Can breathe air if they need to, but will use their gills most of the time

Question 6

Are most lungfish obligate or facultative?

Answer 6

Facultative

Question 7

What is an advantage of being a facultative lungfish vs an obligate lungfish?

Answer 7

They don’t have to periodically go to the surface and potentially be exposed to predators

Question 8

What is the first step in the respiratory cycle of lungfish?

Answer 8

Mouth opens, the buccal cavity expands, and air enters the buccal cavity

Question 9

What is the second step in the respiratory cycle of lungfish?

Answer 9

Mouth closes, buccal cavity compresses, air enters the anterior chamber

Question 10

What is the third step in the respiratory cycle of lungfish?

Answer 10

The anterior chamber closes, the posterior chamber contracts, depleted air exhaled from the posterior chamber, old air leaves through the operculum

Question 11

What is the fourth step in the respiratory cycle of lungfish?

Answer 11

Anterior chamber opens, fresh air flows into the posterior chamber