Effects on the Blood (Circulatory) System Red blood cells serve to carry oxygen to the body's tissues.
(System Red blood cells; serve; to carry oxygen to the body's tissues) Context(System Red blood cells serve,List([35, 63))):(System Red blood cells; serve to carry; oxygen; to the body's tissues)
System Red blood cells serve,List([35, 63))
System Red blood cells System Red blood cells
serve serve to carry
to carry oxygen to the body's tissues
oxygen to the body's tissues