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Anatomy of a Branchial Chamber

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Questions and Answers

What is the purpose of the gill bailer's reversal of current every few minutes?

To loosen and flush out silt and debris from the gills (correct)
To increase the temperature of the water
To increase the flow of water through the branchial chamber
To reduce the amount of oxygen in the water

What is the primary function of the gill bailer in the branchial chamber?

To pump blood through the gills
To drive water forward in the channel and out of the branchial chamber (correct)
To regulate the salinity of the water
To filter food particles from the water

What is the color of the mature, egg-filled ovaries of the female American lobster after cooking?

Rich dark green
Bright red (correct)
Flesh-colored
Bright yellow

Where do the paired oviducts terminate in the female American lobster?

At the base of the third pair of thoracic legs (A) Signup and view all the answers

What is the shape of the ovaries in the female American lobster?

H-shaped (B) Signup and view all the answers

What is the stage of ovarian development indicated by the color of the ovaries?

Color of the ovaries (B) Signup and view all the answers

What type of sensory cells are found on the edges of the mantle-lobes?

Tactile and photoreceptors (A) Signup and view all the answers

What is the reproductive system of freshwater clams characterized as?

Dioecious (C) Signup and view all the answers

What is the name of the parasitic larval stage in freshwater clams?

Glochidium (C) Signup and view all the answers

Where are the gonads located in freshwater clams?

Among the intestinal coils in the visceral mass (D) Signup and view all the answers

What is the function of the coelornic epithelium in the gonads?

To produce gametes (C) Signup and view all the answers

Where do the genital apertures open into?

The supra-branchial chamber of the inner gill lamina (C) Signup and view all the answers

What is the function of the cecum in a crab?

To regulate the concentration of salts in the hemolymph in dilute media (A) Signup and view all the answers

How does the blood circulation system in a crab differ from that of a shrimp or lobster?

It is similar, with no notable differences (C) Signup and view all the answers

What is the role of the sternal artery in a crab's circulatory system?

It carries blood ventrally into the abdomen (A) Signup and view all the answers

What is unique about the heart of a crab?

It is broad and fills much of the pericardial sinus (D) Signup and view all the answers

What is the main difference between the ventral abdominal artery of a crab and a lobster?

The crab's artery is smaller and less complex (B) Signup and view all the answers

What is a characteristic of the nervous system of most crabs?

It is highly fused and centralized (D) Signup and view all the answers

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