Exercise 13- Contraction of Skeletal Muscle (A. and B.)
Explain why muscles are stiff (contracted) when rigor mortis occurs
After death ATP production stops. W/O ATP cross bridges cross bridges cannot detach from actin binding sites so muscles remain stiff.
T/F Glycerinated skeletal muscle fibers need calcium in order to contract.
False
Weight Lifter uses:
Fast glyclotic
Which type of muscle would fatigue faster, one that has many blood vessels, or one that has fewer blood vessels? Explain
Fewer because it has lower Oxygen capacity. Oxygen causes more production of ATP by glycolysis. Lactic acid produced contributes to fatigue.
Large muscles, such as the muscles of the leg have more muscle fibers than small muscles, such as the muscles of the finger. Explain why the muscles of the finger cannot develop as much force as the muscles of the leg.
Finger muscle fibers have fewer myofibrils, therefore fewer cross bridges than your leg muscles. Force development is dependent on the # of cross bridges attached to actin
Smiling is an example of:
Fused Tetanus
Marathon Runner uses
Slow oxidative
T/F - ATP causes the detachment of myosin from actin
True
T/F Glycerinated skeletal muscle fibers need ATP in order to contract.
True
Muscle Spasm is an example of :
Unfused tetanus
Fast oxidative-glycolytic
a.) Is pink in color b.) Has glycogen stores c.) Generates ATP by aerobic respiration or glycolysis
Fast Glycolytic Muscle Fibers
a.) Largest in diameter b.) fastest contraction velocity c.) recruited last d.) has glycogen stores e.) myoglobin content is low
Slow Oxidative Muscle Fibers....
a.) smallest in diameter b.) has many capillaries c.) red in color d.) generates ATP by aerobic respiration e.)has the slowest myosin ATPhase f.) Recruited first
100- Meter Dash runner uses
fast oxidative glyclotic fibers
Fast oxidative- glcolytic and Fast Glycolytic both have:
glycogen stores
Cardiac Fibrillation is an example of a:
twitch
Facial Muscle Tic is an example of:
twitch