What muscls don't work in pairs?

Most muscles work in pairs, known as antagonistic pairs, where one muscle contracts while the other relaxes. However, some muscles, like the diaphragm, function independently to facilitate breathing without a direct opposing muscle. Additionally, certain muscles in the eye, such as the lateral and medial rectus, can also work in a more coordinated manner rather than strictly in pairs. Overall, while the majority of skeletal muscles operate in pairs, there are exceptions based on their specific functions.