Muscle Fibre Types

Front

Types of muscle fibre

Back

3

Answer explanation

There are 3 types of muscle fibers: Type I (slow-twitch), Type IIa (fast-twitch), and Type IIb (fast-twitch). Each type has distinct characteristics suited for different physical activities.

Front

Muscle fibre types: Type 1, 2a, and ?

Back

Type 2b

Answer explanation

Type 2b muscle fibers are fast-twitch fibers that generate high force and are used for explosive activities. They complement Type 1 and 2a fibers, which are more endurance-oriented, making Type 2b the correct missing type.

Front

Muscle fibre type with high aerobic capacity:

Back

Type 1

Answer explanation

Type 1 muscle fibers, also known as slow-twitch fibers, have a high aerobic capacity, making them efficient for endurance activities. In contrast, type 2 fibers (a, b, x) are more suited for anaerobic, high-intensity efforts.

Front

Muscle fibre type for 800m run:

Back

type 2a

Answer explanation

Type 2a muscle fibers are fast-twitch fibers that provide a balance of power and endurance, making them ideal for middle-distance events like the 800 metre run, as they can sustain activity longer than type 2b or 2x fibers.

Front

Slow twitch fibres are also known as?

Back

Type 1

Answer explanation

Slow twitch fibres are also known as Type 1 fibres. They are designed for endurance and are more efficient at using oxygen to generate energy, making them ideal for prolonged activities.

Front

Type 1 muscle fibres colour

Back

red

Answer explanation

Type 1 muscle fibres are known as slow-twitch fibres and are rich in myoglobin, giving them a red color. This distinguishes them from Type 2 fibres, which are typically white. Therefore, the correct answer is red.

Front

Type 2a muscle fibres colour

Back

pink

Answer explanation

Type 2a muscle fibres are classified as fast-twitch fibres and have a pinkish color due to their moderate myoglobin content, which is less than that of red fibres but more than white fibres.

Front

Type 2b muscle fibres colour

Back

white

Answer explanation

Type 2b muscle fibres are known for their fast-twitch capabilities and are classified as white fibres due to their lower myoglobin content, which gives them a paler appearance compared to red or pink fibres.

Front

Slow twitch fibres are red due to high oxygen supply.

Back

Red color indicates high oxygen supply.

Answer explanation

Slow twitch fibres are red in colour due to a high level of oxygen supply, which is essential for their endurance and aerobic metabolism. This distinguishes them from fast twitch fibres, which are lighter in colour.

Front

Slow twitch muscles work aerobically, allowing prolonged activity with O2 present.

Back

work aerobically with O2 present.

Answer explanation

Slow twitch muscles work aerobically, meaning they can sustain activity for long periods as long as oxygen (O2) is present. This is essential for endurance activities.