The form of myosin in slow-twitch muscle fibers causes the muscle fibers to contract more Blank______.Multiple choice question.slowlyquickly

Question Analysis

The form of myosin present in slow-twitch muscle fibers significantly affects the contraction speed and endurance of these muscles. Slow-twitch muscle fibers, also known as type I fibers, have a different composition of myosin compared to fast-twitch fibers, influencing their physiological functions.

Answer Selection

1. Myosin in slow-twitch muscles has a lower ATPase activity compared to fast-twitch myosin. This means that slow-twitch fibers hydrolyze ATP at a slower rate.
2. Due to their structure and properties, slow-twitch muscle fibers are more efficient at using oxygen to generate ATP through aerobic metabolism, which allows for sustained, longer contractions.
3. Slow-twitch fibers are primarily involved in endurance activities, such as long-distance running or cycling, instead of quick bursts of power.

Final Answer

The form of myosin in slow-twitch muscle fibers causes the muscle fibers to contract more slowly.