Oxygen is poorly soluble, making it impossible to transport more than a few millimeters in […]

Lymphatic system

Blood in the heart is highly pressurized, but most of that pressure is lost as […]


A differentiated part of an organism, such as an eye, wing, or leaf, that performs […]

Skeletal system

Three increasingly-magnified photos of a histology slide featuring human bone. Bone marrow The average adult […]


Thought to be antigen-free, the thymus is a primary lymphoid organ with two major functions: […]

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