Biology 1114H Animals 2: Circulation and Invertebrate Phyla Practice Quiz

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

In closed circulatory systems, blood remains inside vessels, while in open circulatory systems, hemolymph leaves vessels.

What is the primary function of circulatory systems?

To move nutrients, oxygen, carbon dioxide, and waste products around the body.

Which of the following does not have any circulatory system?

Nematode

Which organism is not triploblastic?

Sea anemone

How do annelids differ from platyhelminthes?

Annelids have a coelom.

What is the function of the radula?

Radulas are used for feeding in squid.

How do nematodes move?

They have only longitudinal muscles and don't move like annelid worms.

How do annelid worms differ from cnidaria?

Annelid worms have coeloms.

In molluscs, what does the blastopore become?

The mouth.

How do Lophotrochozoa differ from Ecdysozoa?

Lophotrochozoans don't shed cuticles or exoskeletons.

What is hemolymph?

A fluid similar to blood found in open circulatory systems.

What distinguishes blood from hemolymph?

Hemolymph mixes with other body fluids in open circulatory systems.

Where does the exchange of nutrients and oxygen occur in closed circulatory systems?

In capillaries.

What type of circulatory system do annelids have?

Closed circulatory system.

What type of circulatory system do molluscs have?

Open circulatory system.

What is the role of the heart in closed circulatory systems?

To pump blood through vessels.

What is a coelom?

A body cavity that is completely surrounded by mesoderm.

What type of muscles do annelids have?

Both circular and longitudinal muscles.

What type of organisms typically have an open circulatory system?

Most arthropods and molluscs.

What is the primary component of blood?

Red blood cells, plasma, and platelets.

What is the primary component of hemolymph?

It contains nutrients, waste, and immune cells.

What is the significance of capillaries in closed circulatory systems?

They allow for the exchange of materials between blood and tissues.