Question 1

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-can be transformed into another fibre type by specific training

Accepted Answer

Slow-oxidative fibers, also known as type I fibers, have the ability to be transformed into fast-oxidative fibers, also known as type IIa fibers, through specific training. Fast-glycolytic fibers, also known as type IIb fibers, are not able to be transformed into another fiber type through training.

Question 2

Indicate which characteristic applies to which type of muscle by using the answer code (options may be used more than once or not at all).
-load exceeds muscle tension

Accepted Answer

In an isometric contraction, the muscle tension stays the same while the load or external force being applied exceeds the tension generated by the muscle. This results in the muscle not changing its length, but instead staying in a static position.

Question 3

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-has myosin ATPase activity

Accepted Answer

The answer of Indicate which of the characteristics in question...

Question 4

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-most resistant to fatigue

Accepted Answer

Slow-oxidative fibres are the most resistant to fatigue, as they contain high amounts of mitochondria and myoglobin, allowing for sustained aerobic energy production.

Question 5

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-the most powerful fibre

Accepted Answer

Fast-glycolytic fibres are the most powerful fibre type due to their high contraction speed and ability to generate large amounts of force. They primarily use anaerobic metabolism to produce energy, which allows them to contract quickly but fatigue easily. Slow-oxidative fibres, on the other hand, are the least powerful but have high endurance due to their reliance on aerobic metabolism. Fast-oxidative fibres have more power than slow-oxidative but less than fast-glycolytic, and also have higher endurance than fast-glycolytic but lower than slow-oxidative.

Question 6

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-found predominantly in muscles designed for endurance

Accepted Answer

The answer of Indicate which of the characteristics in question...

Question 7

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-has abundant glycolytic enzymes

Accepted Answer

Fast-glycolytic fibers are known for their abundance of glycolytic enzymes, which allow them to generate energy quickly through anaerobic metabolism, making them well-suited for short, intense bursts of activity.

Question 8

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-has numerous mitochondria

Accepted Answer

The answer of Indicate which of the characteristics in question...

Question 9

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-found predominantly in muscles adapted for short-duration,high-intensity activities

Accepted Answer

Fast-glycolytic fibres are suited for short-duration, high-intensity activities because they can generate ATP quickly through anaerobic glycolysis. Slow-oxidative fibres, on the other hand, are better suited for endurance activities as they rely on aerobic metabolism to generate sustained energy. Fast-oxidative fibres are intermediate between the two and are used for activities that require both endurance and power, such as sprinting.

Question 10

Indicate which characteristic applies to which type of muscle by using the answer code (options may be used more than once or not at all).
-length changes

Accepted Answer

Isotonic contractions are characterized by a change in muscle length, such as when lifting an object, where the muscle shortens or lengthens while the tension remains constant. Isometric contractions, on the other hand, involve no change in muscle length but maintain tension, such as when holding an object still.

Question 11

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-requires a constant supply of oxygen

Accepted Answer

Slow-oxidative fibres require a constant supply of oxygen in order to generate ATP aerobically.

Answer: B
 Fast-oxidative fibres also require a constant supply of oxygen to generate ATP aerobically, although they can also generate ATP anaerobically when needed.

Answer: C
 Fast-glycolytic fibres primarily generate ATP anaerobically through glycolysis, and therefore do not require a constant supply of oxygen.

Question 12

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-uses up considerable glycogen

Accepted Answer

The answer of Indicate which of the characteristics in question...

Question 13

Indicate which characteristic applies to which type of muscle by using the answer code (options may be used more than once or not at all).
-muscle tension exceeds the load

Accepted Answer

In an isotonic contraction, the tension generated by the muscle is greater than the load, which results in movement (shortening or lengthening) of the muscle. Isometric contractions occur when the muscle tension is equal to the load, resulting in no movement.

Question 14

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-hypertrophies in response to weight training

Accepted Answer

Fast-glycolytic fibres are the muscle fibres that hypertrophy in response to weight training.

Question 15

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-contains considerable myoglobin

Accepted Answer

Slow-oxidative fibers contain considerable myoglobin to support aerobic metabolism and produce sustained contractions for activities such as endurance running.

Answer: B
 Fast-oxidative fibers contain some myoglobin and rely on aerobic metabolism for energy production, but also have high levels of enzymes that support faster contraction speeds, making them suitable for activities such as sprinting.

Answer: C
 Fast-glycolytic fibers have little myoglobin and rely mainly on anaerobic metabolism for energy production, enabling short bursts of powerful contractions for activities such as weightlifting or sprinting.

Question 16

Indicate which characteristic applies to which type of muscle by using the answer code (options may be used more than once or not at all).
-length remains constant

Accepted Answer

Choice Letter(s) or Number(s): isometric contraction 
 Isometric contraction is the type of muscle contraction where the length of the muscle remains constant.

Question 17

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-has the largest diameter

Accepted Answer

Fast-glycolytic fibers (C) have the largest diameter among the muscle fiber types, which allows them to generate more power and force, although they fatigue more quickly than the other types.

Question 18

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-produces the most lactic acid

Accepted Answer

Fast-glycolytic fibers rely primarily on anaerobic glycolysis to produce energy, which results in high levels of lactic acid production. Slow-oxidative fibers rely primarily on aerobic metabolism and produce little lactic acid, while fast-oxidative fibers rely on a combination of aerobic and anaerobic metabolism but produce less lactic acid than fast-glycolytic fibers.

Question 19

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-most readily fatigues

Accepted Answer

The answer of Indicate which of the characteristics in question...

Question 20

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all).
-runs down the middle of the I band

Accepted Answer

The Z line is the structure that runs down the middle of the I band, separating it from the A band.

Quiz 6: Muscle Physiology

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -can be transformed into another fibre type by specific training

Indicate which characteristic applies to which type of muscle by using the answer code (options may be used more than once or not at all) . -load exceeds muscle tension

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -has myosin ATPase activity

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -most resistant to fatigue

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -the most powerful fibre

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -found predominantly in muscles designed for endurance

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -has abundant glycolytic enzymes

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -has numerous mitochondria

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -found predominantly in muscles adapted for short-duration,high-intensity activities

Indicate which characteristic applies to which type of muscle by using the answer code (options may be used more than once or not at all) . -length changes

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -requires a constant supply of oxygen

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -uses up considerable glycogen

Indicate which characteristic applies to which type of muscle by using the answer code (options may be used more than once or not at all) . -muscle tension exceeds the load

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -hypertrophies in response to weight training

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -contains considerable myoglobin

Indicate which characteristic applies to which type of muscle by using the answer code (options may be used more than once or not at all) . -length remains constant

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -has the largest diameter

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -produces the most lactic acid

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all) . -most readily fatigues

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all) . -runs down the middle of the I band