Muscles and Movement Key

  1. VERTEBRATE MUSCLE TISSUES
    1. What characteristic of muscle tissue enables movement? contractile fibrils
    2. Matching: 1. Smooth 2. Skeletal 3. Cardiac
        SkeletalAttached to bones   SkeletalVoluntary control
        CardiacHeart muscle   Cardiac, SkeletalSarcolemma present
        SkeletalMultinucleate fibers   Cardiac, SkeletalStriations present
        Cardiac, SmoothInvoluntary control   SmoothIn walls of blood vessels
        SkeletalRapid contraction, but quickly tiring   Cardiac, SmoothRhythmic, untiring contractions
    3. Draw a few teased muscle fibers
  2. SKELETAL MUSCLE ACTION
    1. Indicate the action of the antagonists to muscles that cause:
      flexion: EXTENSION;         adduction: ABDUCTION
    2. The stationary end of a muscle is the ORIGIN;   the action end of a muscle is the INSERTION.
    3. Considering Figure 4, indicate the site of insertion for each: Biceps: NEAR THE ELBOW IN THE RADIUS; Triceps: ELBOW/ULNA
    4. Are most muscle insertions arranged to provide maximum mechanical advantage" NO, close to fulcrum, greater freedom & speed of movement
    5. Is the vertebrate body adapted for speed of movement or great strength?
    6. Indicate the directional movement and lever class for each illustration in Figure 6:
      1. ADDUCTOR 1
      2. FLEXOR 3
      3. FLEXOR 3
      4. ABDUCTOR 1
      5. FLEXOR 3
      6. EXTENSOR 2?
      7. ABDUCTOR 3
  3. FROG MUSCLES
  4. STRUCTURE AND CONTRACTION
    1. Write the term that matches the phrase:
      1. Thick myofilement with cross bridges: MYOSIN
      2. Thin myofilements attached to Z lines: ACTIN
      3. Form boundaries of sarcomere: Z LINES
      4. Myofilements composing I band: ACTIN
Lab notes made Sep 05, 2007 by Peter Chen