The human skeletal system is a complex network of bones, joints, and cartilage that provides support, protection, and movement to the body. In this article, we will explore the key features of the human skeletal system and provide an answer key to help you understand the different parts of the skeletal system.
The Structure of the Skeletal System
The human skeletal system consists of 206 bones, which are connected by joints and held together by ligaments and tendons. These bones are divided into two main categories: the axial skeleton, which includes the skull, spine, and ribcage, and the appendicular skeleton, which includes the arms, legs, and pelvic girdle.
The Axial Skeleton
The skull is made up of 22 bones, which protect the brain and support the face. The spine, or vertebral column, is made up of 33 vertebrae, which provide support and flexibility to the body. The ribcage is made up of 12 pairs of ribs, which protect the heart and lungs.
The Appendicular Skeleton
The arms are made up of three bones: the humerus, radius, and ulna. The hands are made up of 27 bones, including the carpals, metacarpals, and phalanges. The legs are made up of four bones: the femur, tibia, fibula, and patella. The feet are made up of 26 bones, including the tarsals, metatarsals, and phalanges.
The Functions of the Skeletal System
The skeletal system has several important functions, including support, protection, movement, and storage. The bones of the skeletal system provide support for the body and help maintain its shape. They also protect vital organs, such as the brain, heart, and lungs. The skeletal system also allows for movement by providing attachment points for muscles and facilitating joint movement. Finally, the skeletal system stores important minerals, such as calcium and phosphorus, which are used to maintain bone health.
Common Skeletal System Disorders
There are several common skeletal system disorders, including osteoporosis, arthritis, and scoliosis. Osteoporosis is a condition in which the bones become weak and brittle, increasing the risk of fractures. Arthritis is a joint disorder that causes inflammation and pain. Scoliosis is a curvature of the spine that can cause pain and discomfort.
In conclusion, the human skeletal system is a complex network of bones, joints, and cartilage that provides support, protection, and movement to the body. Understanding the key features of the skeletal system is important for maintaining bone health and preventing common skeletal system disorders. We hope that this answer key has helped you understand the different parts of the skeletal system and their functions.