Signs and symptoms of the chronic phase of Chagas disease may occur 10 to 20 years after initial infection, or they may never occur. In severe cases, however, Chagas disease signs and symptoms may include: 1  Irregular heartbeat.2  Congestive heart failure. 3  Sudden cardiac arrest.4  Difficulty swallowing due to enlarged esophagus.igns and symptoms of the chronic phase of Chagas disease may occur 10 to 20 years after initial infection, or they may never occur. In severe cases, however, Chagas disease signs and symptoms may include: 1  Irregular heartbeat.
Behind the octopus's head, directly opposite the arms, is its mantle. The mantle is a highly muscled structure that houses all of the animal's organs. Its gills, hearts, digestive system and reproductive glands are all crammed into this one space.
Mantle of a Giant Clam. Ernest Manewal / Lonely Planet Images / Getty Images. Definition: The mantle is an important part of the body of a mollusk. It forms the outer wall of the mollusk's body and encloses the mollusk's visceral mass (internal organs, including the heart, stomach, intestines and gonads).In mollusks that have shells (e.g., clams, mussels, snails), the mantle is what secretes calcium carbonate to form the mollusk's shell.t forms the outer wall of the mollusk's body and encloses the mollusk's visceral mass (internal organs, including the heart, stomach, intestines and gonads). In mollusks that have shells (e.g., clams, mussels, snails), the mantle is what secretes calcium carbonate to form the mollusk's shell.