Which organ is known for its role in storing blood?

The liver is known for its significant role in storing blood, primarily due to its unique vascular architecture and function. It contains a large reserve of blood within its sinusoids, which are specialized capillary-like vessels that allow for the storage and filtration of blood. The liver can hold approximately 10% of the total blood volume in the body at any given time, acting as a blood reservoir.

Additionally, during times of high blood volume or in response to physical activity, the liver releases stored blood back into circulation, helping to regulate blood pressure and flow. This capacity to both store and release blood as needed is crucial for maintaining homeostasis within the body.

In contrast, while the lungs, heart, and kidneys play essential roles in the circulatory and excretory systems, they do not serve as blood storage organs in the same way that the liver does. The lung's primary function is gas exchange, the heart's role is to pump blood, and the kidneys are involved in filtering waste from the blood but do not function as storage organs.