Comparison of Skeletal Muscle to Other Muscle Types - SKELETAL MUSCLE---STRIATED VOLUNTARY- (matching w/ cardiac muscle) Flashcards
General Characteristics of Muscle Fibers. What are they?
a. Appearance
b. Nuclei
c. Striations/Stripes
d. Contraction
e. Control
Appearance
Very large, long, thin, may extend to a foot or more
Nuclei
Hundreds per cell
Striations/Stripes
Due to visible actin and myosin filaments
Contraction
Stimulated by nerves
Control
Conscious/voluntary
Thin fibers with little power; Contract slowly.
Slow Twitch/Slow Oxidative Fibers
Thick fibers with powerful contractions; Contract quickly for speed
Fast Twitch/Fast Glycolytic Fibers
Designed to contract for long periods. Resistant to
fatigue. Good for endurance sports like marathons and swimming.
Slow Twitch/Slow Oxidative Fibers
Designed to contract for short periods.
Fatigue more easily. Good for short bouts of exercise, as in sprinting,
jumping, weight lifting.
Fast Twitch/Fast Glycolytic Fibers
Contain myoglobin, giving them a dark red color and
an advantage at aerobic metabolism.
Slow Twitch/Slow Oxidative Fibers
Lack myoglobin, giving them a pale or whitish color and causing
them to rely on anaerobic metabolism.
Fast Twitch/Fast Glycolytic Fibers
Contract for long periods because they use aerobic metabolism
to make ATP.
Slow Twitch/Slow Oxidative Fibers
Contract for short periods because they use anaerobic metabolism
to make ATP.
Fast Twitch/Fast Glycolytic Fibers
Intermediate Fibers
Fast Twitch/Fast Glycolytic Fibers with the endurance of slow twitch/slow oxidative fibers
