Synovial joints are freely movable joints that allow for a wide range of motion. They are characterized by the presence of a synovial membrane, which lines the joint cavity and produces synovial fluid.

The gluteus maximus is the largest muscle in the human body. It is located on the buttocks and is responsible for extending the hip joint.

The skeletal system has three main functions: support, protection, and movement. It provides support for the body, protects the internal organs, and allows for movement.

The humerus is the bone that forms the upper part of the arm. It extends from the shoulder joint to the elbow joint.

There are three types of muscle contractions: isotonic, isometric, and eccentric. Isotonic contractions involve the shortening of the muscle, isometric contractions involve the tensing of the muscle without shortening, and eccentric contractions involve the lengthening of the muscle.

The atlanto-occipital joint is the joint between the skull and the first cervical vertebra. It allows for nodding and shaking of the head.

There are three main types of gait: normal gait, antalgic gait, and Trendelenburg gait. Normal gait is the typical pattern of walking, antalgic gait is a limping gait caused by pain, and Trendelenburg gait is a gait in which the hip drops on the affected side during walking.

The biceps brachii is the muscle that is responsible for flexing the elbow joint. It is located on the front of the upper arm.

There are four types of bones: long bones, short bones, flat bones, and irregular bones. Long bones are longer than they are wide, short bones are about as long as they are wide, flat bones are thin and broad, and irregular bones have a complex shape.

The tibiofibular joint is the joint between the two bones of the lower leg, the tibia and the fibula. It allows for rotation of the foot.

There are three types of muscle fibers: Type I muscle fibers, Type IIa muscle fibers, and Type IIb muscle fibers. Type I muscle fibers are slow-twitch fibers that are used for endurance activities, Type IIa muscle fibers are fast-twitch fibers that are used for power activities, and Type IIb muscle fibers are fast-twitch fibers that are used for explosive activities.

The calcaneus is the bone that forms the heel. It is the largest bone in the foot.

There are three main types of joint movement: flexion, extension, and abduction. Flexion is the bending of a joint, extension is the straightening of a joint, and abduction is the movement of a limb away from the midline of the body.

The quadriceps femoris is the muscle that is responsible for extending the knee joint. It is located on the front of the thigh.

There are three main types of foot deformities: flatfoot, high-arched foot, and bunions. Flatfoot is a condition in which the arch of the foot is flattened, high-arched foot is a condition in which the arch of the foot is too high, and bunions are bony bumps that form on the big toe.