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Watch this video and then answer the questions.

https://mediaplayer.pearsoncmg.com/assets/secs-bio-figure-walkthroughs-the-structure-function-fish-gills

Part A Which statement about the gas exchange system in fish is correct? It enables oxygen to move from where its partial pressure is lower to where its partial pressure is higher It relies on a higher partial pressure of oxygen in water than in air It enables oxygen to diffuse from the water into the blood over the entire length of the gill capillaries. It relies on the parallel flow of blood and water in the gills Submit Request Answer

Explanation / Answer

Part-A (C) It enable oxygen to diffuse from water into the blood over the entire length of gill filament.

Part-B- (b) The partial pressure of oxygen is lowest in blood where partial pressure of oxygen in water is highest.

Part-C- (d) Ther will be a net diffusion of oxygen from water to blood only if the paertial ressure of oxygen in water is greater than100 mm Hg.

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