For a skeletal muscle to remain rigidly contracted, it needs a continual supply of ATP. Yet, when a skeletal muscle runs out of ATP (in a corpse), it becomes rigid. How can you explain this seeming paradox? Explain how skeletal muscle may remain relaxed even if ATP levels are high.

Using the sliding filament theory of contraction, explain why the contraction strength of a muscle is maximal at a particular muscle length.

While Colette is researching weight lifting techniques, she finds contradictory information about the "best" way to build muscle. Which of the following statements is true of skeletal muscle? O The speed of muscle contraction is not dependent on how fast the myosin heads split ATP. O Anaerobic exercise depends on oxygen. O Slow oxidative fibers have a low myoglobin content and are used for explosive muscle movements, like sprinting. O Fast glycolytic fibers are used for actions like weightlifting, fatigue very quickly, and have very little myoglobin content.

The human body has mainly two types of muscle fibres: slow-twitch and fast-twitch.  The { slow or fast} twitch  contract slowly and resist fatigue and produce most of their energy through { aerobic or anaerobis} rispiration. These muscle fibres are best used for activities like { weight lifting and playing tennis or biking and jogging} The { slow or fast} twitch  are adapted for the rapid regeneration of power. They can best be used in activities such as { weight lifting and playing tennis or biking and jogging}. They are rich in glycogen and depend on { aerobic or anaerobis} rispiration.  to produce energy. This leaves them vulnerable to the accumulation of lactate and they fatigue quickly. which one are those? the answers