Musculoskeletal System
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The musculoskeletal system consists of two main systems - the skeletal system and the muscular system. The three types of muscles are smooth, skeletal, and cardiac muscles. Skeletal muscles are voluntary muscles that produce movement and are attached to bones via tendons. Bones provide structure, protect organs, allow movement, produce blood cells, and store minerals. The skeletal system works with skeletal muscles to provide functions like protection, support, movement, and mineral storage.
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Musculoskeletal System
- 2. Introduction The Musculoskeletal system is made up of two different systems. It is important to know how each system works.
- 3. Three Types of Muscles The three types of muscles tissues are: Smooth Skeletal Cardiac
- 4. Smooth Muscle smooth (or visceral) muscle- forms the muscle layers in the walls of the digestive tract, bladder, various ducts, arteries and veins, and other internal organs. Smooth- muscle cells are elongated and thin, have only one nucleus, and form sheets rather than bundles of muscles. Smooth muscle is controlled by the autonomic nervous system (ANS).
- 6. Skeletal Muscle skeletal (or voluntary/striated) muscle, is the most abundant tissue in the human body, it produces movement. Each skeletal-muscle fiber is roughly cylindrical, contains many nuclei, and is crossed by alternating light and dark bands called striations . Fibers bind together, via connective tissue , into bundles; and these bundles, in turn, bind together to form muscles. Thus, skeletal muscles are composite structures composed of many muscle fibers, nerves, blood vessels, and connective tissue. Skeletal muscles are controlled by the somatic nervous system (SNS).
- 8. Cardiac Muscle cardiac (or heart) muscle, a cross between the smooth and striated muscles, makes up the heart tissue. Like smooth muscle, it is controlled by the autonomic nervous system (ANS).
- 10. Muscle Function There are two important proteins involved in muscle function. Actin Myosin They overlap at an area called the sarcomere. Video 1 Video2
- 11. Muscle Function
- 12. Skeletal System Its 206 bones form a rigid framework to which the softer tissues and organs of the body are attached. Vital organs are protected by the skeletal system. They also function to move, support, produce red and white blood cells and store minerals.
- 13. The parts of the skeleton The human skeleton is divided into two distinct parts: Axial Appendicular
- 14. Axial Skeleton The axial skeleton consists of bones that form the axis of the body and support and protect the organs of the head, neck, and trunk. The Skull The Sternum The Ribs The Vertebral Column
- 15. Appendicular Skeleton The appendicular skeleton is composed of bones that anchor the appendages to the axial skeleton. The Upper Extremities The Lower Extremities The Shoulder Girdle The Pelvic Girdle --(the sacrum and coccyx are considered part of the vertebral column)
- 16. Sacrum
- 17. Composition of bones Bone is not a uniformly solid material, but rather has some spaces between its hard elements. Two types of bone tissue Compact Spongy
- 18. Compact Bone The hard outer layer of bones is composed of compact bone tissue, so-called due to its minimal gaps and spaces. This tissue gives bones their smooth, white, and solid appearance, and accounts for 80% of the total bone mass of an adult skeleton.
- 19. Spongy Bone Filling the interior of the organ is the trabecular bone tissue (an open cell porous network also called cancellous or spongy bone) which is composed of a network of rod- and plate-like elements that make the overall organ lighter and allowing room for blood vessels and marrow. Trabecular bone accounts for the remaining 20% of total bone mass, but has nearly ten times the surface area of compact bone.
- 20. Bone Cells Osteoblasts: are mononucleate bone-forming cells. Osteoblasts also manufacture hormones , to act on the bone itself. Osteocytes originate from osteoblasts. Their functions include formation of bone, matrix maintenance and calcium homeostasis. Osteoclasts are the cells responsible for bone resorption (remodeling of bone to reduce its volume).
- 21. Five different types of bones Long (femur) Short (carpus) Flat (sternum) Irregular (vertebrae) Sesamoid (embedded in tendon)
- 22. Disorders Bone fracture Osteomyelitis Osteoporosis Osteosarcoma Osteogenesis imperfecta Arthritis
- 23. How do they work together? The musculoskeletal system consists of the skeletal system -- bones and joints and the skeletal muscle system. These two systems work together to provide basic functions that are essential to life, including: Protection Support Blood cell formation Mineral homeostasis Storage: stores fat and minerals. Leverage
- 24. Tissues involved There are 5 basic tissues comprising the musculoskeletal system: bones , ligaments (attaching bone to bone) cartilage (protective gel-like substance lining the joints and intervertebral discs), skeletal muscles tendons (attaching muscle to bone).
- 25. How do our muscles and bones work together to cause locomotion? Joint: where two bones meet 2 types: Structural Functional
- 26. Structural Joints Fibrous Cartilaginous Synovial
- 27. If you have a weak stomach look away now!!
- 28. Functional Joints Functional joints are classified by the range of movement they provide synarthroses amphiarthroses diarthrosis
- 29. Moveable joints Ball and socket Hinge Pivot Gliding Saddle Condyloid
- 30. Categories of moveable joints
- 32. How do muscles work to move joints? Flexor Vs Abductor Flexor contracts Abductor extends
- 33. Homeostasis and muscles Feedback loop Cold weather Reflex Muscles help you respond to changes in your environment by enabling you to move.