What causes muscle fatigue? a. Muscles running out of ATP b. An imbalance of cal

Question

What causes muscle fatigue? a. Muscles running out of ATP b. An imbalance of calcium and potassium c. Actin and myosin becoming stretched out d. Sodium being transported outside of the sarcolemma Charlie, a beginning body builder, is attempting to lift 600 lbs to impress someone at the gym. Why can't he move the weights? a. He's not trying hard enough b. Charlie needs some additional stimulation from his nervous system to lift that much c. Charlie is already using all of his contractile elements d. Charlie has run out of ATP Which of the following statements is true? a. Large motor units have relatively large fibers but very few fibers b. Small motor units have relatively small fibers but many fibers c. Large motor units have a range of fiber sires included d. Motor units are made of fibers that all have the same twitch speed Which type of fiber has the most myoglobin? a. Slow oxidative fibers b. Fast oxidative fibers c. Slow glycolytic fibers d. Fast glycolytic fibers At what point of contraction do muscles become too restrictive to allow transport of oxygen and glucose? a. 50% b. 70% c. 85% d. 100% Beth is typing on the computer. She can type 120 words per minute. To move her fingers, she is using a lot of a. Fast twitch white fibers b. Fast twitch red fibers c. Slow twitch white fibers d. Slow twitch red fibers Where is the ion used in muscular contraction stored inside skeletal muscles until it is needed? a. The T-tubles b. The sacroplasmic reticulum c. The neurolema d. The golgi apartus

Explanation / Answer

Ans 28 A muscles running out of ATP

When a person is exercising vigorously, body requires more oxygen to produce ATP, when there are inadequate supply of oxygen, anaerobic respiration causes accumulation of lactic acid in muscles and ATP is not produced, as a result muscle undergoes fatigue

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