Why are the spatial relations in the squid so confusing? when the animal swims o
ID: 3165508 • Letter: W
Question
Why are the spatial relations in the squid so confusing? when the animal swims one end goes forward first. why not call that anterior end instead of dorsal? Alternatively, the eyes mouths and tentacles are found at one end. why not call that anterior end?
The tubules of each annelid nephridium convey coelomic waste and fluid outward towards the nephridiopore. The tubules are surrounded by capillaries from the segmented blood vessels. What is the purpose of intimate association between the blood vessels and the tubules? In the most efficient countercurrent arrangement, should the blood flow in the same or the opposite direction to the tubular fluid?Explain.
We noted that modern researchers have isolated the genes coding for spider silk protein. So what? what if anything can they do with that knowledge? Explain.
Which organisms have book gills and book lungs? Compare structure and function of each.
Explanation / Answer
2. The purpose of intimate association between the blood vessels and the tubules is to permit both extensive filtration from the blood and selective reabsorption into the blood.
In the most efficient countercurrent arrangement, the blood flow should in the same direction to the tubular fluid.
3. Now researchers have found the genes coding for spider silk protein. This has applications in areas ranging from medicine to ballistics.
4. Book lung is found is many arachnids such as scorpions and spiders.
Book gills are found in horseshoe crabs.
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