Unit 3 Test - Muscle Fiber Types

Type l contraction speed

slow

Type lla contraction speed

fast

Type lla contraction speed

fast

Type l ATP pathway

aerobic

Type lla ATP pathway

aerobic

Type llb ATP pathway

anaerobic

Type l glycogen store

high

Type lla glycogen store

medium

Type llb glycogen store

low

Type l rate of fatigue

low

Type lla rate of fatigue

medium

Type llb rate of fatigue

high

Type l color

red

Type lla color

pink

Type llb color

white

Type l fiber diameter

narrow

Type lla fiber diameter

medium

Type llb fiber diameter

wider

Type l mitochondria

high

Type lla mitochondria

medium

Type llb mitochondria

low

Type l capillaries

high

Type lla capillaries

medium

Type llb capillaries

low

Type l sample sport that is most appropriate

marathon

Type lla sport that is most appropriate

soccer

Type llb sport that is most appropriate

power lift

Which skeletal muscle fiber type exhibits the highest resistance to fatigue, making it predominantly recruited during long-distance endurance events like a marathon?

Type l

Which fiber type possesses the highest concentration of myoglobin (a dark red protein that carries and stores oxygen) and mitochondrial density, giving the muscle tissue a characteristically dark red appearance?

Type l

Which skeletal muscle fiber type uses ATP?

All

According to Henneman's size principle, which fiber type is recruited first by the central nervous system during low-intensity, sustained muscle contractions?

Type l

Which fiber type is known as "fast-oxidative glycolytic" because it combines fast contraction speeds with a substantial capacity for both aerobic and anaerobic metabolism?

Type lla

Which muscle fiber type exhibits the highest myosin ATPase activity, enabling the fastest contraction speed and maximal peak power output?

Type llb

Muscles like eye movers, the triceps, and the gastrocnemius are dependent upon which type of muscle fiber?

Type llb

Which fiber type exhibits the highest concentration of anaerobic glycolytic enzymes, such as phosphofructokinase (PFK), alongside low oxidative enzyme levels?

Type llb

A world-class elite 100-meter sprinter who relies heavily on rapid, explosive acceleration would naturally possess a significantly higher percentage of which muscle fiber type?

Type llb

Which muscle fiber type is surrounded by the densest capillary network to ensure a continuous and rapid supply of oxygen and fuel during prolonged exercise?

Type l

Which skeletal muscle fiber type generally displays the smallest cross-sectional (diameter) size, limiting its maximal raw force production per individual fiber compared to fast-twitch fibers?

Type l

Which muscle fiber type does the soleus predominantly have?

Type l

Which muscle fiber type is the most common in all humans?

Type l

Which muscle fiber type is a “training chameleon”, meaning they are adaptable to the type of training presented. They can adapt to endurance training or to strength training?

Type lla

Which skeletal muscle fiber type relies primarily on anaerobic glycolysis as its dominant energy pathway, resulting in rapid force production but very quick fatigue?

Type llb