Answer the questions in detail.
Describe the parts of the skeletal system.
Answers
Answer:
The skeletal system is your body’s central framework. It consists of bones and connective tissue, including cartilage, tendons, and ligaments. It’s also called the musculoskeletal systemThe skeletal system is a network of many different parts that work together to help you move. The main part of your skeletal system consists of your bones, hard structures that create your body’s framework — the skeleton. There are 206 bones in an adult human skeleton. Each bone has three main layers:
Periosteum: The periosteum is a tough membrane that covers and protects the outside of the bone.
Compact bone: Below the periosteum, compact bone is white, hard, and smooth. It provides structural support and protection.
Spongy bone: The core, inner layer of the bone is softer than compact bone. It has small holes called pores to store marrow.
The other components of your skeletal system include:
Cartilage: This smooth and flexible substance covers the tips of your bones where they meet. It enables bones to move without friction (rubbing against each other). When cartilage wears away, as in arthritis, it can be painful and cause movement problems.
Joints: A joint is where two or more bones in the body come together. There are three different joint types. The types of joints are:
Immovable joints: Immovable joints don’t let the bones move at all, like the joints between your skull bones.
Partly movable joints: These joints allow limited movement. The joints in your rib cage are partly movable joints.
Movable joints: Movable joints allow a wide range of motion. Your elbow, shoulder, and knee are movable joints.
Ligaments: Bands of strong connective tissue called ligaments hold bones together.
Tendons: Tendons are bands of tissue that connect the ends of a muscle to your bone.
Explanation:
The skull and cross-bones symbol has been used for a very long time to represent death, perhaps because after death and decomposition, bones are all that remain. Many people think of bones as being dead, dry, and brittle. These adjectives may correctly describe the bones of a preserved skeleton, but the bones of a living human being are very much alive. Living bones are also strong and flexible. Bones are the major organs of the skeletal system.The skeletal system is the organ system that provides an internal framework for the human body. Why do you need a skeletal system? Try to imagine what you would look like without it. You would be a soft, wobbly pile of skin containing muscles and internal organs but no bones. You might look something like a very large slug. Not that you would be able to see yourself — folds of skin would droop down over your eyes and block your vision because of your lack of skull bones. You could push the skin out of the way if you could only move your arms, but you need bones for that as well!
Components of the Skeletal System
In adults, the skeletal system includes 206 bones, many of which are shown in the figure below. Bones are organs made of dense connective tissues, mainly the tough protein collagen. Bones contain blood vessels, nerves, and other tissues. Bones are hard and rigid due to deposits of calcium and other mineral salts within their living tissues. Locations, where two or more bones meet, are called joints. Many joints allow bones to move like levers. For example, your elbow is a joint that allows you to bend and straighten your arm.Besides bones, the skeletal system includes cartilage and ligaments.
Cartilage is a type of dense connective tissue, made of tough protein fibers. It is strong but flexible and very smooth. It covers the ends of bones at joints, providing a smooth surface for bones to move over.
Ligaments are bands of fibrous connective tissue that hold bones together. They keep the bones of the skeleton in place.
Axial and Appendicular Skeletons
The skeleton is traditionally divided into two major parts: the axial skeleton and the appendicular skeleton, both of which are pictured below.
The axial skeleton forms the axis of the body. It includes the skull, vertebral column (spine), and rib cage. The bones of the axial skeleton, along with ligaments and muscles, allow the human body to maintain its upright posture. The axial skeleton also transmits weight from the head, trunk, and upper extremities down the back to the lower extremities. In addition, the bones protect the brain and organs in the chest.
The appendicular skeleton forms the appendages and their attachments to the axial skeleton. It includes the bones of the arms and legs, hands and feet, and shoulder and pelvic girdles. The bones of the appendicular skeleton make possible locomotion and other movements of the appendages. They also protect the major organs of digestion, excretion, and reproduction.