11.9 Schematic dagam or an open orutryystem as seen in dans. Cheek Your Progress
ID: 192573 • Letter: 1
Question
11.9 Schematic dagam or an open orutryystem as seen in dans. Cheek Your Progress 2.1 List several features of the freshwater clam that enable it to thrive as a sedentary, aquatic organism 2.2 What is the excretory organ of bivalves? Where in the body is it located 2.3 Why do you suppose the adductor muscles are so well developed in bivalves 2.4 Describe how the gills of a clam are an example of a moltifunctional organ. 2.5 Discuss some of the disadvantages of an open circulatory system Explaring Zoelegy& Laboratory GideExplanation / Answer
2.1) Freshwater clams are stationary filter feeders, which burrow beneath the sand and extend their siphons throughout the sand to filter water into their bodies and remove oxygen and nutrients.
2.2) The excretory organ of bivalves is the kidney or nephridium which is located ventral to the heart.
2.3) Adductor muscles are well developed in bivalves to close shell and hold valves tightly together. The reason may be to protect itself from a predator and for when the bivalve is exposed to the air by low water levels.
2.4) The gills of a clams are an example of a multifunctional organ. Each gill discloses a double fold of tissue with small edges, which increase surface area for the process of respiration and filter feeding. The gills in female freshwater clams play an essential role in reproduction. Females brood fertilized eggs in special pouches in the gills until the eggs are ready to hatch.
2.5) There is a limited capability for animals, which have an open circulatory system to increase or decrease distribution and velocity of blood flow. There is not a lot of variation to oxygen uptake because changes in such are very slow, because of the limits to diffusion, animals with open circulatory systems have relatively low metabolic rates.
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