How alary muscle help to flow the blood in cockroaches?

In cockroaches, alary muscles are thin, membranous structures that attach to the heart and help regulate blood flow within their open circulatory system. When these muscles contract, they expand the heart, creating a vacuum that draws hemolymph (the insect equivalent of blood) into the heart from the body cavity. This mechanism aids in the circulation of hemolymph throughout the body, ensuring that nutrients and oxygen are delivered effectively to tissues. Additionally, the alary muscles help maintain the heart's position and support its rhythmic contractions.