Why is the circulatory system described as a 'double circulatory system'?
Understand the Problem
The question is asking us to identify the reason why the circulatory system is referred to as a 'double circulatory system'. We need to select the correct statement that explains this characteristic of the circulatory system.
Answer
Blood passes through the heart twice in each complete circuit.
The circulatory system is described as a 'double circulatory system' because blood passes through the heart twice during one complete circuit. This ensures that oxygenated and deoxygenated blood are separated, optimizing oxygen delivery to the body.
Answer for screen readers
The circulatory system is described as a 'double circulatory system' because blood passes through the heart twice during one complete circuit. This ensures that oxygenated and deoxygenated blood are separated, optimizing oxygen delivery to the body.
More Information
The double circulatory system is found in mammals, birds, and some amphibians.
Tips
A common mistake is to confuse the terms 'double circulation' and 'single circulation'. Single circulation, found in fish, involves blood passing through the heart only once in each circuit.
Sources
- Why is the heart and circulatory system described as a 'double loop'? - homework.study.com
- Double Circulation - Blood Circulation in Humans - BYJU'S - byjus.com
- What is a Double Circulatory System? - Study Mind - studymind.co.uk
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