What Muscles can contract while extending a joint or flexing a joint what is the name for these types of movements?

Muscles that contract while extending a joint are called extensor muscles, while those that contract during flexing a joint are known as flexor muscles. These movements are collectively referred to as antagonistic movements, where one muscle group (the flexors) acts to bend the joint, while the opposing group (the extensors) acts to straighten it. This coordinated action allows for smooth and controlled movements.