Muscle fibers that fatigue quickly, are light in color, and contain little or no myoglobin are -twitch fibers.

Select all correct descriptions of fast-twitch muscle fibers.Multiple select question.Helpful in sprinting or swinging a golf clubHighly resistant to fatigueUsually anaerobicMany fibers in motor unitsDark in color

Match the muscle fiber type with its characteristics.1. Respond rapidly to nervous system stimulation 2. Fatigue quickly 3. Contain large amounts of myoglobin 4. Break down ATP relatively slowly 5. High glycogen concentration 6. High aerobic capacity

Which of the following describes slow-twitch fibers?Multiple ChoiceThey have few mitochondria.They have very little myoglobin.They have a rich blood supply.They have high levels of lactic acid.They rely on anaerobic respiration.

Slow-twitch muscle fibers have a Blank______ myoglobin content. Multiple choice question.highlow

Which statement best describes fast-twitch muscle fibers?Multiple Choicemotor unit contains many fibers that are designed for strength and working under anaerobic conditionsmotor units that contain many fibers are are designed for endurance and working under anaerobic conditionsmotor units with few muscle fibers that are useful for endurance activitiesdark in color, contain large numbers of mitochondria and good for strength