The video tutorial explores the circulatory systems in animals, focusing on the open system in crustaceans like Acelus aquaticus. It demonstrates how to prepare and observe a young Acelus under a microscope to study its hemolymph flow. The tutorial explains the differences between open and closed circulatory systems, highlighting the role of pleopods in increasing surface area for oxygen diffusion.

Which tool is used to withdraw a young Acelus from its container?

• A pair of tweezers

• A plastic pipette

• A glass rod

• A small net

Why is it important not to squash the Acelus during examination?

• It would make the circulatory system less visible.

• It could damage the microscope.

• It would prevent the observation of fluid movement.

• It could harm the specimen.

What is observed when examining the large rear limbs of Acelus under the microscope?

• The color of the limb

• The structure of the limb

• The texture of the skin

• The movement of hemolymph

What is the primary reason for selecting a young Acelus for observation?

• They are larger, providing a better view.

• They have less pigment, making their circulatory system more visible.

• They are more active, showing better fluid movement.

• They are easier to handle.

What is the main difference between open and closed circulatory systems?

• Open systems have fluid bathing the cells directly, closed systems have blood in vessels.

• Open systems use air for oxygen transport, closed systems use water.

• Open systems have blood flowing in vessels, closed systems do not.

• Open systems are found in vertebrates, closed systems in invertebrates.

What is the fluid called that circulates in the limbs of Acelus?

• Plasma

• Hemolymph

• Lymph

• Blood

What is the function of pleopods in Acelus aquaticus?

• To aid in swimming

• To increase surface area for oxygen diffusion

• To protect the abdomen

• To store nutrients