Energy and respiration

Question 1

Why is energy more expensive for fish than humans?

Answer 1

Less oxygen in water.
Water is denser and more viscous.
Fish use unidirectional breathing, while terrestrial organisms mostly use bidirectional

Question 2

Give an example of active respiration.

Answer 2

Teleosts close their opercular valves, fill their mouths with water, then re-open the opercular valves.

Question 3

True or false: Hemoglobin’s affinity for O2 decreases as temperature increases.

Answer 3

True.

Question 4

True or false: Hemoglobin’s affinity for O2 increases as pH increases.

Answer 4

True.