What type of machine are the joints of the human body?

The joints of the human body are classified as synovial joints. These joints are characterized by the presence of a synovial cavity, where the ends of bones meet and are surrounded by a joint capsule. Synovial joints allow for a wide range of movement and are found in various parts of the body, such as the knees, elbows, shoulders, and hips.

To arrive at this conclusion, one can refer to anatomy textbooks or reliable online sources that describe and categorize the different types of joints in the human body. The information presented in these sources provides a detailed understanding of the structure and classification of joints.