The Roman Snail is a European snail that is commonly used to make escargot. It also goes by the names of:the Burgundy snail, Roman snail, edible snail or escargot
To inhale, the snail widens the respiratory cavity by lowering the cavity floor. Due to the resulting low pressure, air rich in oxygen flows into the cavity. Gas exchange takes place at the cavity's roof. There the tissue is particularly thin, so oxygen (O2) diffuses into the blood fluid circulating there. In the opposite direction carbon dioxide (CO2) diffuses from the blood into the air, following the gradient of gas contained in air and blood respectively. To assist this gas exchange, the snail closes the pneumostome and raises the cavity floor, thus increasing pressure inside the pallial cavity and the rate of oxygen diffusion into the blood. To exhale the depleted air, the snail finally opens the pneumostome and raises the cavity floor to press out the air. So the respiratory cavity floor performs the same task as does the human diaphragm in respiration.
To inhale, the snail widens the respiratory cavity by lowering the cavity floor. Due to the resulting low pressure, air rich in oxygen flows into the cavity. Gas exchange takes place at the cavity's roof. There the tissue is particularly thin, so oxygen (O2) diffuses into the blood fluid circulating there. In the opposite direction carbon dioxide (CO2) diffuses from the blood into the air, following the gradient of gas contained in air and blood respectively. To assist this gas exchange, the snail closes the pneumostome and raises the cavity floor, thus increasing pressure inside the pallial cavity and the rate of oxygen diffusion into the blood. To exhale the depleted air, the snail finally opens the pneumostome and raises the cavity floor to press out the air. So the respiratory cavity floor performs the same task as does the human diaphragm in respiration.