The given diagram shows the difference between the countercurrent and concurrent exchangesystem in fish:
Correct answer: D. Option D
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
In fish, countercurrent exchange is a highly efficient system for gas exchange in the gills, where water and blood flow in opposite directions, maximizing oxygen uptake. Concurrent exchange, on the other hand, involves water and blood flowing in the same direction, resulting in a less efficient transfer of oxygen. Counter current exchange ensures blood is always exposed to water with a higher oxygen concentration. Concurrent exchange quickly equalizes the oxygen concentration, reducing the efficiency of oxygen uptake.So option D is correct.
Last updated
About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
Practise Respiration
446 free Respiration MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
About 70% of the carbon dioxide is carried in blood as:
All characteristics of Hemoglobin EXCEPT:
An increase in carbon dioxide concentration makes haemoglobin release oxygen more readily. This is known as
Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs
As the pH of blood decreases, H+ ions increase, which combine with the protein part of hemoglobin to reduce its ability to bind with: