Question

multiple choice 2 points
which of the following is predominately made up of myosin?
f actin
the thick filament
the thin filament
g actin
the elastic filament

Explanation:

Identify the components of muscle filaments

To understand which structure is made of myosin, we examine the molecular components of muscle fibers involved in Skeletal Muscle Contraction. Myofibrils contain three types of filaments: thick, thin, and elastic.

Analyze the composition of each option

• F-actin (filamentous actin) and G-actin (globular actin) are the primary structural proteins that make up the thin filaments.
• The thin filament is composed mainly of actin, along with regulatory proteins tropomyosin and troponin.
• The elastic filament is made of the giant protein titin, which anchors thick filaments to the Z discs.
• The thick filament is composed almost entirely of hundreds of molecules of the motor protein myosin.

Determine the correct match

Since myosin molecules bundle together to form the thick filaments, the structure predominately made up of myosin is the thick filament.

Answer:

• F-actin
• The thick filament (Correct answer)
• The thin filament
• G-actin
• The elastic filament