Квиз по строению скелетных мышц

What does sarcolemma represent?

• Cytoplasm of muscle fiber

• Mitochondria in muscle fiber

• Cell membrane of muscle

• Endoplasmic reticulum of muscle fiber

What is a sarcomere?

• Functional unit of muscle

• Site of attachment of actin filaments

• Structure of thick filament

• Site of attachment of myosin filaments

What are thin filaments made of?

• Actin

• Troponin

• Myosin

• Tropomyosin

What does the I-band represent?

• Strip where actin and myosin overlap

• Dark band corresponding to myosin filaments

• Light band corresponding to actin filaments

• Band consisting only of myosin filaments

What is the Z-line?

• Attachment site of actin filaments

• Attachment site of myosin filaments

• Site of actin and myosin overlap

• Structure of thin filament

What is the H-zone?

• Area inside the A-band consisting only of myosin filaments

• Area inside the I-band corresponding to actin filaments

• Area inside the Z-line where actin and myosin overlap

• Area inside the A-band where actin and myosin overlap

What is a thick filament?

• Filament where actin and myosin overlap

• Filament consisting of myosin proteins

• Structure of sarcomere

• Filament consisting of actin proteins

What is a thin filament?

• Filament where actin and myosin overlap

• Sarcomere structure

• Filament consisting of myosin proteins

• Filament consisting of actin proteins

What is myosin?

• Protein component of thick filament

• Protein component of thin filament

• Protein that binds to actin at regular intervals

• Protein that binds to actin in Z-line

What is actin?

• Protein component of thick filament

• Protein component of thin filament

• Protein that binds to myosin in Z-line

• Protein that binds to myosin at regular intervals