Muscle Fiber Types Quiz: How Many Are There?

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Questions and Answers

Which type of muscle fiber has a smaller fiber diameter?

Intermediate muscle fibers

All types have similar fiber diameters

Red muscle fibers (correct)

White muscle fibers

Which type of muscle fiber is rich in myoglobin?

White muscle fibers

Red muscle fibers (correct)

Intermediate muscle fibers

All types have equal myoglobin levels

Which type of muscle fiber has an extensive sarcoplasmic reticulum?

White muscle fibers (correct)

Red muscle fibers

Intermediate muscle fibers

All types have a similar amount of sarcoplasmic reticulum

Which type of muscle fiber has numerous mitochondria?

Red muscle fibers Signup and view all the answers

Which type of muscle fiber is characterized by larger nerve fibers for innervation?

White muscle fibers Signup and view all the answers

Which protein forms an elastic mesh and anchors thick filaments to the Z disc?

Titin Signup and view all the answers

Which protein binds calcium in skeletal muscle?

Troponin C Signup and view all the answers

What protein binds to tropomyosin in skeletal muscle?

Troponin I Signup and view all the answers

Which protein occupies the grooves of thin filaments in skeletal muscle?

Tropomyosin Signup and view all the answers

In skeletal muscle contraction, what happens to the width of the A band?

It remains unaltered Signup and view all the answers

Which of the following statements about the myotendinous junction is correct?

Collagen fibers from the tendon insert themselves among and deep into muscle fibers and become continuous with reticular fibers of the endomysium. Signup and view all the answers

What is the primary component of the skeletal muscle cell that is composed of longitudinal arrays of cylindrical myofibrils?

Myofibril Signup and view all the answers

What is the structure that bisects the I band in a skeletal muscle myofibril?

Z disk (Z line) Signup and view all the answers

What is the region of the myofibril between two successive Z disks referred to as?

Sarcomere Signup and view all the answers

Which of the following statements about the thick and thin myofilaments is correct?

The dark bands (A bands) are composed of thick myofilaments, which are $15$ nm in diameter and $1.5$ μm long. Signup and view all the answers

What is the primary function of muscle tissue?

Heat generation Signup and view all the answers

From which type of mesoderm does cardiac muscle originate?

Splanchnopleuric mesoderm Signup and view all the answers

How are muscle contractions primarily facilitated in all types of muscle tissue?

By the sliding interaction of thick myosin filaments along thin actin filaments Signup and view all the answers

Where are most skeletal muscles derived from?

Somatic mesoderm Signup and view all the answers

What characteristic distinguishes skeletal muscle cells?

They have cross-striations and are multinucleated Signup and view all the answers

Study Notes

Muscle Fibers

Type I muscle fibers have a smaller fiber diameter.
Type I muscle fibers are rich in myoglobin.
Type II muscle fibers have an extensive sarcoplasmic reticulum.
Type I muscle fibers have numerous mitochondria.
Type II muscle fibers are characterized by larger nerve fibers for innervation.

Muscle Proteins

Titin forms an elastic mesh and anchors thick filaments to the Z disc.
Troponin binds calcium in skeletal muscle.
Tropomyosin binds to troponin in skeletal muscle.
Actin occupies the grooves of thin filaments in skeletal muscle.

Muscle Contraction

During skeletal muscle contraction, the width of the A band remains constant.
Muscle contractions are primarily facilitated by the sliding filament theory in all types of muscle tissue.

Myofibril Structure

The primary component of the skeletal muscle cell is composed of longitudinal arrays of cylindrical myofibrils.
The M line bisects the I band in a skeletal muscle myofibril.
The region of the myofibril between two successive Z disks is referred to as a sarcomere.
Thick myofilaments are composed of myosin, while thin myofilaments are composed of actin, tropomyosin, and troponin.

Muscle Tissue

The primary function of muscle tissue is to convert chemical energy into mechanical energy.
Cardiac muscle originates from lateral plate mesoderm.
Most skeletal muscles are derived from somites.
The characteristic that distinguishes skeletal muscle cells is their multinucleated, voluntary, and striated nature.

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Description

Test your knowledge on skeletal muscle fiber types, including characteristics of red, white, and intermediate muscle fibers. Explore topics such as fiber diameter, myoglobin quantity, mitochondria count, and more.