Muscular System Quiz #1

  1. Name three structure(s) where you would find smooth muscles:
    • Veins
    • Intestine
    • Stomach
  2. Name three structure(s) where you would find skeletal muscles:
    • Biceps
    • Triceps
    • Calves
  3. Name the structure(s) where you would find cardiac muscles:
    The Heart
  4. Name the muscle that is:
    Surrounded and bundled by connective tissue
    Skeletal Muscle
  5. Name the muscle that is:
    Not Striated
    Single Nucleus
    Found mainly in the walls of hollow organs
    Smooth Muscle
  6. Name the muscle that is:
    Usually has single nucleus
    Cardiac Muscle
  7. The four functions of muscles are:
    • Maintaining Posture
    • Producing Movement
    • Stabilizing Joints
    • Generating Heat
  8. What are the two contractile filaments?
    • Actin
    • Myosin
  9. Sheet-like connective tissue that attaches muscles to structures
  10. Cord-like connective tissue that attaches muscles to structures
  11. What is the smallest contractile unit of mucle?
  12. What is the name of the thin membrane that is ACH binding site?
  13. Connective tissue surrounding a fascicle
  14. Connective tissue ensheathing the entire muscle
  15. A muscle cell
  16. Name of point where nerve and muscle connect.
    Neuromuscular junction
  17. Name of the structure inside the muscle that holds Ca+.
    Sarcoplasmic reticulum
  18. A contraction in which:
    Myofilaments are able to slide past each other during contractions
    The muscle shortens
  19. A contraction in which:
    Tension in the muscles increases
    The muscle is unable t o shorten
  20. What respone is:
    Single, brief contraction
    Not a normal muscle function
  21. What response is:
    One contraction immediately folled by another
    Muscle do not completely return to a resting state
  22. When a muscle is fatigued....
    it is unable to contract
  23. Common reason for muscle fatigue is....
    Oxygen debt
  24. Oxygen is required to...
    get rid of accumulated lactic acid
  25. Increasing acidity (from lactic acid) and lack of ATP causes...
    the muscle to contract less
  26. Muscles uses stored what for energy?
  27. ATP is broken to...
    release energy
  28. How much of ATP is stored by muscles?
    4-6 seconds worth
  29. A response in which:
    No evidence of relaxation before the follings contractions
    The result is a sustained muscle contraction
    Fused (complete) tetanus
  30. A response in which:
    Some relaxation occurs between contractions
    The results are summed
    Unfused (incomplete) tetanus
  31. Different degress of skeletal muscle shortening
    Graded Responses
  32. Sodium rushing into the cell generates -- ------ --------- in which once muscle contraction is started cannot be stopped.
    an action potential
  33. Chemical released by nerve upon arrival of nerve impulse
  34. What is the neurotransmitter for skeletal muscle?
    Acetylcholine (ACh)
  35. One neuron in which muscle cells are stimulated by
    Motor Unit
  36. Ability to receive and respond to a stimulus
  37. Ability to shorten when an adequate stimulus is received
  38. Name of connective tissue that surrounds a single muscle fiber.
  39. The part of the muscle a doctor taps on with the little hammer
  40. What is the space between the nerve and muscle?
    Synaptic Cleft
  41. A discrete bundle of muscle cells
  42. Plasma membrane of the muscle cell
  43. A long fulamentous organelle found within muscle cells that has a banded appearance
  44. Actin- or myosin- containing structure
  45. Image Upload 1
  46. Image Upload 2
  47. Image Upload 3
  48. 8 steps of a skeletal muscle contraction:
    1. Nerve impluse arrives at neuromuscular junction
    2. ACh is released into the synaptic cleft where it binds to receptors on the sarcolemma of the muscle
    3. ACh binding causes Na+ (sodium) to rapidly enter the muscle, building up a positive electrical charge called an action potential
    4. When enough Na+ has entered, the threshold is reached and the action potential spreads down the length of the muscle
    5. Electric impluse causes Ca+ (calcium) to be released by the sarcoplasmic reticulum (SR)
    6. Ca+ binds to actin, exposing binding sites for myosin to attach to
    7. Myosin uses ATP to extend myosin heads to the actin filament, causing a link between the 2 called cross bridge
    8. Myosin heads are flexed forward, causing a shortening of the sarcomere and bringing about a muscle contraction
Card Set
Muscular System Quiz #1
Test on 12/09/11