Slow twitch muscles are needed for:
1. high-intensity, quick, short bursts of energy
2. endurance activities
3. speed or power activities
4. low endurance and short duration exercises
Slow twitch muscles are actually needed for endurance activities. These muscles are characterized by their ability to contract repeatedly without fatiguing quickly. They rely on a steady supply of oxygen and are responsible for sustained, aerobic activities such as long distance running, cycling, or swimming.
To determine which answer is correct, we can consider the characteristics of slow twitch muscles. Slow twitch muscles are rich in mitochondria, which help produce energy aerobically (using oxygen). They are also highly vascularized, meaning they have a good supply of blood vessels to deliver oxygen and nutrients.
Looking at the given options:
1. High-intensity, quick, short bursts of energy: This requires fast twitch muscles, as they can generate a lot of force quickly, but they fatigue faster than slow twitch muscles.
2. Endurance activities: This correctly describes the role of slow twitch muscles.
3. Speed or power activities: These activities require fast twitch muscles, as they can contract quickly and generate high levels of force.
4. Low endurance and short duration exercises: Slow twitch muscles excel in endurance and are not well-suited for short, intense exercises.
Therefore, the correct answer is option 2: endurance activities.