A&P Exam #4, Questions Game Challenge

  1. What is the action of the deltoid?
    abducts, extends, and flexes arm
  2. Isometric is what kind of contraction?
    muscle contracts (there is change in force) but does not change in length
  3. What is the site where an axon and a muscle fiber meet?
    the neurmuscular junction (NMJ) (or myoneural junction)
  4. What are the two types of proteins in muscle fibers?
    protein (thick filament) and actin (thin filament)
  5. I bands are made of what?
    they are composed of thin actin (protein) filaments…(held by direct attachments to structures called Z lines, which appear in the center of the I bands)
  6. What is the origin and insertion of the levator scapulae?
    origin: cervical vertebrae / insertion: scapula
  7. Why do birds that migrate long distances have dark flesh?
    because they have abundant dark, slow-twitch muscles...
  8. A twitch has a brief delay between the time of stimulation and the time of contraction, what is the name of the delay?
    the latent period
  9. What is a fascicle?
    a small bundle of muscle fibers
  10. What muscle helps you smile?
  11. Acetylcholine (ACh) is synthesized where?
    synthesized in the cytoplasm of the motor neuron
  12. What happens when calcium is removed from the cytoplasm?
    the muscle relaxes...
  13. Creatine phospate stores energy that quickly converts what?
    quickly converts ADP to ATP
  14. The aerobic phase occurs where?
    it occurs in the mitochondria (the complete breakdown of glucose)
  15. What is the refractory period?
    a short period after a nerve or muscle cell fires during which the cell cannot respond to additional stimulation (can be stimulated but won't respond)
  16. Where would you find the extensor digitorum?
    in the forearm...
  17. The names of muscles often describe them, what a name indicate?
    the muscle's size, shape, location, action, number of attachments, or direction of fibers...
  18. What are the four components of levers?
    (1) rigid bar - bones (2) fulcrum - parts on which bar moves; joint (3) object - moved against resistance; weight (4) force - supplies energy for movement; muscles

    Toss-up question from last class!
  19. A layer of connective tissue that surrounds a skeletal muscle is what?
  20. What is it called when you increase the number of activated motor units?
  21. What is the origin and insertion of the trapezius?
    origin: occipital & vertebrae / insertion: clavicle & scapula
  22. What is the action of the infraspinatus?
    rotates arm laterally
  23. What are the two muscles used to raise your eyebrows?
    epicranius frontalis and occipitalis
  24. Define peristalsis?
    a wavelike motion; consists of alternate contractions and relaxations of the longitudinal and circular muscles; helping to force the contents of a tube along its length
  25. What is the recording of muscle contraction called?
    a myogram
  26. The irises of the eyes are an example of what?
    a multi-unit smooth muscle
  27. What causes rigor mortis to happen?
    results in an increase in membrane permeability to calcium ions, which promotes cross-bridge attachment, and a decrease in availability of ATP in the muscle fibers, which prevents cross-bridge release from actin…thus, the actin and myosin filaments of the muscle fibers remains linked until the muscles begin to decompose
  28. What three (3) muscles extend the leg at the knee?
    rectus femoris, vastus lateralis, vastus medialis
  29. Neurons release what chemicals in order to communicate with the cells that they control?
  30. Drugs called what are used to treat irregular heart rhythms?
    • calcium channel blockers
    • do it by blocking ion channels that admit extracellular calcium into cardiac muscle cells
  31. What is a sarcomere?
    the structural and functional unit of a myofibril
  32. What do liver cells turn lactic acid into?
  33. What is a connective tissue covering that is associated with muscle forming and is broad, shaped like fibrous sheet, that attaches muscles to other muscles called?
  34. What is the origin and insertion of the Teres minor?
    origin: scapula / insertion: humerus
  35. What is the type of contraction that results in shortening of a muscle?
    concentric, shortening contraction / an isotonic contraction
  36. What is the cell membrane of a muscle cell called?
  37. What is the difference between the origin and the insertion?
    the origin is the unmovable end and the insertion is the movable end
  38. What are two things that cause smooth muscle to contract?
    acetylcholine (ACh) & norepinephrine (NE)
  39. What is cordlike part that attaches a muscle to a bone?
  40. What does lactic acid accumulation result in?
    it results in oxygen debt
  41. What is the enzyme that removes acetylcholine (ACh) from the synapse?
    • acetylcholinesterase…(rapidly decomposes ACh in the synapse; this enzyme present in the synapse and on
    • the membrane of the motor end plate, prevent a single nerve impulse from continuously stimulating a muscle fiber)

    Toss up question!
  42. When a person walk with a constant waddle it called what?
    gluteal gait…(when the gluteus medius and minimus are paralyzed)
  43. What is the action of the buccinator?
    compresses cheeks (blowing)
  44. What are the two major types of smooth muscle fibers?
    visceral smooth muscle and multi-unit smooth muscle
  45. Smooth muscle fibers lack troponin, what protein do they have?
    calmodulin…(binds to calcium ions released when its fibers are stimulated, activating contraction)
  46. The assistant to the prime mover is called what?
  47. True or False: Troponin is a muscle protein who's
    chemical activity cause the contraction of muscle fibers?
    False: Troponin is a protein which acts to block the contraction of the sarcomere
  48. What is one of the first sign of Parkinson's disease?
    shaky hands
  49. What muscle am I contracting when I put my chin to my chest?
  50. What is the function of intercalated discs?
    help cells join, helping transmit the force of contraction from cell to cell; also allow ions to diffuse between cells, allowing muscle impulse to travel rapidly from cell to cell
  51. True or False: Fascicles, Muscles, Thick and thin filaments, Muscle fibers (cells), Myofibrils. Is this the correct order?
    False: Muscle - Fascicles - Muscle fibers (cells) - Myofibrils - Thick and thin filaments.
  52. The muscle used for pouting and to express horror is what?
  53. What is the period of time from time of stimulation and the beginning of contraction?
    latent period
Card Set
A&P Exam #4, Questions Game Challenge
Questions Game Challenge, Exam #4