Which part of the spleen contains blood sinuses?

The part of the spleen that contains blood sinuses is known as the red pulp. The red pulp is a critical component of the spleen's function, as it plays a role in filtering the blood and facilitating the removal of old or damaged red blood cells. In this area, blood flows through a network of sinuses, which are essentially spaces filled with blood that allow for the efficient movement of cells and the exchange of materials. This feature enables the red pulp to effectively carry out its function of filtering and recycling iron from hemolysis, as well as providing a site for immune responses to bloodborne pathogens.

In contrast, the white pulp is involved primarily in immune responses and consists of lymphatic tissue that produces lymphocytes, but it does not contain blood sinuses. The cortex and medulla are terms usually associated with the structure of lymphoid organs or glands, such as the thymus, rather than specifically describing areas of the spleen.