Question

Which statements about the circulatory system of a mollusk are true?

Select all that apply.

A
Gas exchanges takes place by diffusion.

B
It is an open system.

C
It is a closed system.

D
Blood moves through the sinuses into the gills for gas exchange

Answer 1

Answer;

A. Gas exchanges takes place by diffusion.

B. It is an open system.

Step-by-step explanation;

• Most molluscs and arthropods have an open type of circulatory system.
• Open circulatory systems pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells.
• Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood.