1.04 remember the_structures_of_the_muscular_system

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Health Science I
Unit 1.04 Muscular System

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  • *Muscles are responsible for ALL body movement. Muscles allow us to move around and perform involuntary functions such as our heart beating and assisting with our breathing. *Muscles give our bodies form and shape. *Muscles are responsible for producing most of our body heat.
  • Voluntary muscle because it contains nerves under the voluntary control. Each muscle cell is known as a muscle fiber. The cell membrane is called sarcolemma and the cytoplasm is sarcoplasm. Skeletal muscles provide movement to the limbs (arms & legs) but contract quickly, fatigue (tire) easily, and lack the ability to remain contracted for long periods of time. Some other examples of skeletal muscle movement are blinking of the eyes, talking, breathing, dancing, eating, and writing.
  • Small and spindle-shaped. Called smooth muscle because they are unmarked by any distinctive striations. Smooth muscles are not attached to bones. Smooth muscles act slowly, do not tire easily, and can remain contracted for a long time. The action of smooth muscles are controlled by the autonomic (automatic) nervous system. Smooth muscles help to move food along the digestive system, they contract the uterus during labor and childbirth, and they control the diameter of the blood vessels as blood circulates throughout the body.
  • Cardiac muscles require a continuous supply of oxygen to function. If oxygen supply is cut off for even as little as 30 seconds, cardiac muscle cells will start to die.
  • Responsible for opening and closing to control the passage of substances.
  • Location- frontalis=forhead Size- gluteus maximus=largest muscle in the buttocks Direction- external abdominal oblique= edge of the lower rib cage Number of origins- biceps= two headed muscle in the humerus Location of origin and insertion- sternocleidomastoid= origin in the sternum Action flexor- flexor carpi ulnarius= flexes the wrist Extensor- extensor carpi ulnarius= extends the wrist Depressor- depressor anguli oris= depresses the corner of the mouth; raises or lowers body parts
  • Sternocleidomastoid- neck
  • Pectoralis major-major muscle that lies over the upper ribs Deltoid- the muscle that abducts the upper arm at the shoulder joint Biceps Brachii- muscle found in the upper arm
  • Pectoralis major- the muscle that lies over the upper ribs Diaphragm- thoracic muscle which aids in breathing
  • Latissimus dorsi- the main muscle of the lower back Trapezius- the main muscle of the upper back
  • Biceps brachii- the muscle found in the upper arm Deltoid- the muscle that abducts the upper arm at the shoulder joint
  • Gastrocnemius- calf muscle
  • Hamstrings- muscles found on the dorsal surface of the leg
  • 1.04 remember the_structures_of_the_muscular_system

    1. 1. 1.04 Remember the structures of themuscular system
    2. 2. Essential Question• What are the structures of the muscular system? 1.04 Remember the structures of 2 the muscular system
    3. 3. The Muscular System• Comprises nearly half our weight.• Over 650 muscles.• Each muscle is made up of hundreds or thousands of muscle fibers. 1.04 Remember the structures of 3 the muscular system
    4. 4. The Muscular System: Muscle Fibers• Bundles of threadlike structures called myofibrils – Composed of: • Myosin • Actin – Form overlapping pattern called sarcomeremuscle muscle fibersarcolemma sarcomerefunctional unit of muscle movement 1.04 Remember the structures of 4 the muscular system
    5. 5. Structures of the muscular system Muscles Connective Skeletal tissue Smooth Tendons Cardiac Fascia Sphincter 1.04 Remember the structures of 5 the muscular system
    6. 6. Structures of the muscular system Types of muscle Skeletal Smooth Cardiac Sphincter 1.04 Remember the structures of 6 the muscular system
    7. 7. Structures of the muscular systemTypes of Muscle Skeletal muscles Attached to bone Striated (striped) appearance Voluntary Multinucleated (many nuclei) muscle cell bundles 1.04 Remember the structures of 7 the muscular system
    8. 8. Structures of the muscular systemSmooth muscles (visceral muscles)Only one nucleus located in the centerof the cellInvoluntary movementLocated in walls of internal organssuch as stomach, intestines, uterus &blood vessels 1.04 Remember the structures of 8 the muscular system
    9. 9. Structures of the muscular systemCardiac Muscle  Found only in the heart  Striated, branched  Involuntary movement  Cells are fused- when one contracts, they all contract, creating the heartbeat 1.04 Remember the structures of 9 the muscular system
    10. 10. Structures of the muscular systemSphincter musclesAlso called dilator musclesSpecial, circular musclesLocated  Between esophagus and stomach  Between stomach and small intestines  Walls of the anus  Between the urinary bladder and the urethra 1.04 Remember the structures of 10 the muscular system
    11. 11. Structures of the muscular systemTypes of Muscle  Skeletal  Smooth  Cardiac  Sphincter 1.04 Remember the structures of 11 the muscular system
    12. 12. Structures of the muscular systemTypes of Connective tissue  Tendons  Fascia 1.04 Remember the structures of 12 the muscular system
    13. 13. Structures of the muscular systemConnective tissue  Tendons dense bands that connect skeletal muscle to the bone 1.04 Remember the structures of 13 the muscular system
    14. 14. Structures of the muscular systemConnective tissue  Fascia Fibrous connective tissue sheets that wrap around muscle bundles 1.04 Remember the structures of 14 the muscular system
    15. 15. How do skeletal muscles get their names?• However,• not all muscles are named by the above methods! 1.04 Remember the structures of 15 the muscular system
    16. 16. Head & Neck Muscles 1.04 Remember the structures of 16 the muscular system
    17. 17. Torso/Trunk (anterior)1.04 Remember the structures of 17 the muscular system
    18. 18. Torso/Trunk (anterior)1.04 Remember the structures of 18 the muscular system
    19. 19. Torso/Trunk (posterior)1.04 Remember the structures of 19 the muscular system
    20. 20. Upper extremities 1.04 Remember the structures of 20 the muscular system
    21. 21. Lower extremities 1.04 Remember the structures of 21 the muscular system
    22. 22. The muscular system review Anterior view 1.04 Remember the structures of 22 the muscular system
    23. 23. The muscular system review Posterior view 1.04 Remember the structures of 23 the muscular system
    24. 24. 1.04 Remember the structures of the muscular system Essential Question• What are the structures of the muscular system? 1.04 Remember the structures of 24 the muscular system

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