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Muscle Fiber Types and Metabolism Quiz

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Questions and Answers

What is the primary function of actin and myosin in muscle cells?

Actin and myosin control the mitochondrial content of muscle fibers

Actin and myosin are involved in muscle contraction through a sliding filament system (correct)

Actin and myosin are responsible for muscle fiber classification

Actin and myosin regulate intracellular calcium levels

Which statement best describes the energy sources primarily utilized by cardiac muscle?

Cardiac muscle mainly relies on ketone bodies for energy production.

Cardiac muscle depends solely on anaerobic metabolism for energy supply.

Cardiac muscle mainly utilizes fatty acids, glucose, and lactate for energy. (correct)

Cardiac muscle exclusively uses carbohydrates as its energy source.

How are smooth muscles different from skeletal muscles?

Smooth muscles have striations, while skeletal muscles do not.

Smooth muscles contain multinucleated fibers, unlike skeletal muscles.

Skeletal muscles are voluntary, but smooth muscles are involuntary. (correct)

Skeletal muscles are spindle-shaped, while smooth muscles are cylindrical.

What is the role of creatine phosphate in muscle cells during exercise?

Creatine phosphate helps regenerate ATP in muscle cells during exercise. Signup and view all the answers

What happens when there is an absence of the protein dystrophin in the body?

It leads to Duchenne's muscular dystrophy characterized by muscle atrophy. Signup and view all the answers

Which type of muscle fibers have low oxidative capacity and generate most of their ATP through glycolysis?

Type IIB muscle fibers Signup and view all the answers

What is the main source of ATP during exercise in type IIB fast-twitch glycolytic muscle fibers?

Anaerobic glycolysis Signup and view all the answers

What process provides a considerable portion of the ATP requirement at the onset of exercise for the first few minutes?

Glycogenolysis Signup and view all the answers

Which enzyme further inhibits hexokinase in the process of anaerobic glycolysis?

Glucose 6-phosphate Signup and view all the answers

Muscle Fiber Types and Metabolism Quiz

Choose a study mode

Podcast

Questions and Answers

What is the primary function of actin and myosin in muscle cells?

Which statement best describes the energy sources primarily utilized by cardiac muscle?

How are smooth muscles different from skeletal muscles?

What is the role of creatine phosphate in muscle cells during exercise?

What happens when there is an absence of the protein dystrophin in the body?

Which type of muscle fibers have low oxidative capacity and generate most of their ATP through glycolysis?

What is the main source of ATP during exercise in type IIB fast-twitch glycolytic muscle fibers?

What process provides a considerable portion of the ATP requirement at the onset of exercise for the first few minutes?

Which enzyme further inhibits hexokinase in the process of anaerobic glycolysis?

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