1) How does the circulatory system viewed in the squid differ from that viewed i
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Question
1) How does the circulatory system viewed in the squid differ from that viewed in other molluscs? What advantage does this confer? What route does blood follow as it moves through the squid? Start at the systemic heart.
2) Describe the route that water follows as it passes through a clam starting from the incurrent siphon and finishing with the excurrent siphon
3) What is adaptive radiation? Identify two examples of adaptive radiation that you observed in lab today. Be specific and speculation on the advantages conferred in each example.
4) Members of such a large and diverse phylum as Mollusca impact humans in many ways. Discuss this statement. 500 words max.
Explanation / Answer
In molluscs, blood circulatory system is of open type while squids (cephalopod) have close circulatory system. Heart, a pumping station is present in squids, which is absent in other molluscs.
Advantage of close circulatory system
In close system, blood travels in a defined path and hence maintains a pressure. This pressure allows the blood to travel long distances and also requires less time for circulation. These advantages make the animal more agile and fast moving in comparison to sessile molluscs.
Blood flow:
two branchial hearts : pump blood to gills
systemic heart : pump blood to the remaining body
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