LONG ANSWER TYPE (5 MARK)
1. What is double circulation? What is its advantage? Show with labelled diagram.
Hint: Blood flows twice through the heart in one cycle, separation
oxygenated/deoxygenated blood
of
2. How is urine produced? How is it regulated? Hint: Filtration, selective reabsorption:
Amount of water, with hormonal regulation
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Answer:The majority of mammals (including humans) utilize a double circulatory system. This means we have two loops in our body in which blood circulates. One is oxygenated, meaning oxygen rich, and the other is deoxygenated, which means it has little to no oxygen, but a lot of carbon dioxide.
Double circulatory systems are important because they ensure that we are giving our tissues and muscles blood full of oxygen, instead of a mixture of oxygenated and deoxygenated blood. While it may take a bit more energy than a single circulatory system, this system is much more efficient!
Explanation:
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