The Question is from neet-zoology animal-kingdom pisces, and it was created by the author T HARITHA

Question

The circulatory system of most fishes is best described as:

T HARITHA · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Fish circulatory system
 **Related Topics**: Vertebrate circulatory systems, heart chambers, single vs. double circulation
 **Prerequisites**: Basic understanding of circulatory systems and heart anatomy.
## SOLUTION PATHWAY
**Given Information**:
  The question asks for the best description of the circulatory system in most fishes.
**Method & Steps**:
 1. Understand the concept of single and double circulation.
  Reasoning: Single circulation involves blood passing through the heart only once per complete circuit of the body. Double circulation involves blood passing through the heart twice per complete circuit (pulmonary and systemic circulation).
 2. Consider the number of heart chambers in fish.
  Working:  Fishes typically have a two-chambered heart: one atrium and one ventricle.  The blood flows from the atrium to the ventricle and then to the gills for oxygenation before being distributed to the rest of the body.
 3. Combine the information on circulation type and heart chambers.
  Key Point: The single pathway of blood flow through the heart and then to the gills before the body characterizes single circulation. 
 3. Determine the correct description.
  Result: Single circulation with a two-chambered heart.
  Verification: This accurately reflects the anatomy and physiology of the typical fish circulatory system.
 ## OPTION ANALYSIS
A :x: Double circulation involves two separate circuits (pulmonary and systemic). Fish have a single circuit.
B ✓: This correctly describes the fish circulatory system.
C :x: Fish do not have a four-chambered heart. Four-chambered hearts are found in mammals and birds.
D :x:  Fish have a two-chambered heart, not a three-chambered heart. Three-chambered hearts are found in amphibians and reptiles (with some exceptions).
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing single and double circulation: Remember single circulation means the blood passes through the heart once per complete circuit, while double circulation means twice.
  2.Incorrectly associating the number of heart chambers with circulation type: The number of chambers is related to the efficiency of oxygenation, but the fundamental difference between single and double circulation is the number of times blood passes through the heart per circuit.
 **Quick Tips**:
  1.Visualize the blood flow path in a fish:  Heart → Gills → Body → Heart.
  2.Remember that simpler organisms tend to have simpler circulatory systems.

T HARITHA · Answer

Double circulation with a three-chambered heart

T HARITHA · Answer

The correct Option is "Single circulation with a two-chambered heart"

T HARITHA · Answer

Double circulation with a four-chambered heart

T HARITHA · Answer

Single circulation with a three-chambered heart

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