Skeletal & Muscular Systems

Bones are composed of living cells and protein fibers that are encased in deposits of calcium salts. This solid network provides strength and support to the skeletal system. Therefore, the statement "Bones are a solid network of living cells and protein fibers that are surrounded by deposits of calcium salts" is true.

Ball-and-socket joints allow circular movement because they consist of a rounded bone end that fits into a cup-like socket. This structure allows for a wide range of motion in multiple directions, including rotation and circumduction. These joints are found in the shoulders and hips, and they provide stability and mobility to these areas of the body.

The skeletal system is responsible for providing support and structure to the body, protecting internal organs, and facilitating movement through the attachment of muscles. Additionally, the skeletal system plays a role in the production of red blood cells through the bone marrow. However, the regulation of body temperature is primarily controlled by the nervous system and the endocrine system, not the skeletal system.

Ligaments are strips of tough connective tissue that hold bones together. They are responsible for stabilizing joints and preventing excessive movement. Unlike tendons, which connect muscles to bones, ligaments connect bones to other bones. Smooth muscles and striated muscles are types of muscle tissue and are not involved in holding bones together.

Skeletal muscles are joined to bones by tendons. Tendons are strong, fibrous connective tissues that attach muscles to bones. They play a crucial role in transmitting the force generated by the muscles to the bones, allowing for movement and locomotion. Ligaments, on the other hand, connect bones to other bones and provide stability to joints. Cartilage is a flexible connective tissue that cushions joints and allows for smooth movement. While joints are the points of connection between bones, tendons specifically connect muscles to bones.

Smooth muscle is found in the walls of blood vessels. Smooth muscle is a type of muscle tissue that is involuntary and non-striated. It is responsible for the contraction and relaxation of blood vessels, which helps regulate blood pressure and blood flow throughout the body. Smooth muscle in the walls of blood vessels allows them to constrict or dilate in response to various stimuli, such as changes in blood pressure or the need for increased blood flow to specific areas of the body.

The statement is false because the skeletal system is primarily responsible for providing support and protection to the body, producing blood cells, and storing minerals. Body movement is controlled by the muscular system, blood circulation is facilitated by the cardiovascular system, and digestion is aided by the digestive system.

A muscle contracts when the thin filaments of actin slide over the thick filaments of myosin. This sliding movement is facilitated by the interaction between actin and myosin, which causes the muscle fibers to shorten and generate force. Actin and myosin are two key proteins involved in muscle contraction, with actin forming the thin filaments and myosin forming the thick filaments.