A shrimp's heart is located inside its head.

Shrimp belong to a group of animals called decapods, which means they have ten legs. Their bodies are built differently than ours because their head and chest are fused into one big part called the cephalothorax. The heart sits right on the upper back part of this section, protected by a hard shell called a carapace.Instead of having blood vessels like we do, shrimp have an 'open' system. Their heart is a tiny tube that pumps a fluid called hemolymph directly into the spaces around their organs. This fluid carries oxygen and nutrients to keep the shrimp moving and healthy.Scientists have found that a shrimp's heart is very sensitive to its surroundings. For example, a grass shrimp's heart can beat between 120 and 200 times every minute. If the water gets warmer or has less oxygen, the heart has to work much harder.By keeping the heart, stomach, and brain all in one spot, the shrimp's body doesn't have to work as hard to move fluid around. This compact design is common in other sea creatures too, like lobsters and crabs. It is a smart way for small animals to stay energized and protected at the same time.