Skeletal and Muscular System

The exoskeleton of arthropods is composed primarily of chitin, a long-chain polymer of N-acetylglucosamine, which provides structural support and protection.

A fracture is a medical term for a break in the continuity of a bone. It is distinct from a sprain, which involves injury to ligaments.

The femur, or thigh bone, is the longest, heaviest, and strongest bone in the human body. It supports the weight of the body during movement.

The sternum is the medical term for the long, flat bone located in the center of the chest, commonly referred to as the breastbone.

The human cranium, which protects the brain, consists of 8 bones: the frontal, two parietal, two temporal, occipital, sphenoid, and ethmoid bones.

The tongue is a muscular organ in the mouth, primarily composed of skeletal muscle covered with mucous membrane.

Wrong; there are 5 pairs of sacral nerves.

An adult human skeleton is composed of 206 bones. This count includes the bones of the axial and appendicular skeletons.

A ligament is a fibrous connective tissue that connects bone to bone. A tendon connects muscle to bone.

Tendons are fibrous connective tissues that attach muscle to bone, allowing for movement. Ligaments, by contrast, connect bone to bone.

The lowest pair of ribs in the human body is known as Floating ribs .Floating ribs are four a typical ribs (two lower most pairs, XI-XII) in the human ribcage. They are called so because they are attached to the vertebrae only, and not to the sternum or cartilage coming off the sternum.

The human vertebral column consists of 33 vertebrae at birth, but these fuse into 26 distinct bones in adulthood (7 cervical, 12 thoracic, 5 lumbar, 1 sacrum, and 1 coccyx).

The largest bone in the body is the Femur ( thigh bone ). The Femur is the longest, strongest and the heaviest bone in the body. This bone also supports most of our body weight. 

Tendons are tough, fibrous connective tissues that connect skeletal muscles to bones, allowing for movement.

Osteoblasts are bone-forming cells, and when they become trapped in the matrix they secrete, they are called osteocytes. Erythrocytes are red blood cells, and chondrocytes are cartilage cells.