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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Countercurrent flow allows _______ to maximize their oxygen uptake from water.

  1. a. fishes
  2. b. flatworms
  3. c. frogs
  4. d. whales

Summary Introduction

Concept introduction: Countercurrent exchange is the mechanism in which a substance is transferred between two fluids that flows in opposite directions on either of a semipermeable membrane. The respiration process in the fish occurs through their gills.

Explanation

Reason for the correct answer:

The counter current exchange maximizes the efficiency of gas exchange across the gills of fish. Water flows over gills, and blood flows through gill capillaries in the opposite direction. Therefore, the water adjacent to the gill capillaries has more oxygen than the blood flowing inside the capillaries.

Option a. is given as “fishes”. As the countercurrent flow allows the fishes to maximize their oxygen uptake from the water, option a. is correct.

Reasons for the incorrect answers:

Option b. is given as “flatworms”...

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