â¢ In grade 4 mathematics, seven of the 50 states included in the analysis set standards for proficiency (as measured on the NAEP scale) that were lower than the Basic performance on NAEP, 42 were in the NAEP Basic range, and one in the Proficient range. In grade 8 mathematics, 12 of 49 states included in the analysis
noun, plural: skeletal muscles. A voluntary, striated (vertebrate) muscle that is associated with the skeleton, and thus move parts of the skeletal system. Supplement. The muscular system of the vertebrates is comprised of various muscles.
biceps - any skeletal muscle having two origins (but especially the muscle that flexes the forearm) 1  skeletal muscle, striated muscle - a muscle that is connected at either or both ends to a bone and so move parts of the skeleton; a muscle that is characterized by transverse stripes. femoral biceps, musculus biceps femoris - the biceps muscle of the thigh; it flexes the knee and rotates the leg laterally.