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What part of the digestive system would you see in a cross-section anterior to the gizzard of an Earthworm? |
The crop |
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What structure in the Earthworm has a similar function as the human heart? Explain. |
The aortic arches. They pump blood through dorsal and ventral vessels to the rest of the worm like our aorta pumps blood through vessels to the rest of our body. |
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What do two Earthworms exchange during mating? Explain your answer. |
They join at the clitellum to exchange sperm and egg since earthworms have both. |
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Describe the difference bewtween a closed and an open circulatory system |
A closed system has blood closed completely in vessels but in an open one blood is released straight into tissues and cells. |
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Do earthworms have a front and back end? |
Yes. They have a mouth and brain at one end and an anus at the opposite end. |
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What characteristics distinguish an annelid from other worms? |
Annelids have segmented bodies and a coelem which is a tube filled with fluid and contains most of the organs. |
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How many arms does a squid have? How many tentacles? |
8 arms and 2 tentacles |
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What do the arms do and what do the tentacles do? |
The arms of the squid are usually used to grasp objects while tentacles are used to capture and hold prey. |
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What is the function of the water jet? Does the squid swim head first or feet first? |
The water jet is used for propulsion/movement of the squid. They swim head first. |
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What are two external features that are adaptations for the squids predatory life? |
Large eyes and tentacles and arms |
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What are two traits that the squid shares with other mollusks? |
They all have a soft body and bilateral synmetry. |
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How can you tell if a squid is male or female? |
The male gonads are usually white and female ones are yellow. |
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How many gills does the squid have? |
2 |
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Where does the ink sac empty into and what is its function? |
It emptys into the water jet and it holds ink to spray so it can defend itself by distracting predators |
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What is the function of the pen? |
It is used to stabalize the squid for swimming |
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How do wastes exit the squid? |
Waste travels from the anus and exits through the water jet |
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What does the cloaca of a shark do? |
It is a catch all basin that leads to the outside |
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What does the rectal gland of a shark do? |
It regulates the sharks salt balance |
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What does the spiral valve of a shark do? |
It adds surface area to the intestine for digestion and absorption |
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What do rugae in a shark do? |
They help with the churning and mixing of food with digestive juices |
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What do myomeres in a shark do? |
Contractions of the myomeres create a side to side motion which propels the shark forward |
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What does the cloacal opening in a shark do? |
It recieves the products of the intestine, urinary, and genital ducts |
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What do ampullae of Lorenzini in a shark do? |
These are sense organs that are sensitive to change in temperature, water pressure, electrical fields and salinity |
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What do pectoral fins in a shark do? |
They provide the lift the shark needs to keep from sinking (like airplane wings) |
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What do gill slits in a shark do? |
Water taken in from the mouth and spiracles exit through them |
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