Respiratory System
Lobsters use gills to get oxygen into their body. Their gills are feathery organs which extract oxygen from water. The gills can be found at the base of the lobster's legs. Water passes up through openings between the lobsters legs, over the gills and up towards the head. Every few minutes this current of water is reversed the other way so that debris can be flushed out of the chambers.
Lobster Diagram
Blood travels from the gills to other parts of the body, providing oxygen along the way. To maintain a steady supply of oxygen, the gills circulate water for lobsters the way our respiratory system circulates air to breathe.