Muscle Contraction Quiz

What happens to muscles when they contract?

• They lengthen

• They shorten

• They stay the same

• They twist

What is the term for muscles working in pairs to perform opposite actions?

• Synergistic

• Antagonistic

• Cooperative

• Symbiotic

Which order of organization is correct from biggest to smallest?

• Muscle, muscle fibre, myofibril

• Muscle, myofibril, muscle fibre

• Muscle fibre, muscle, myofibril

• Myofibril, muscle fibre, muscle

What are the repeating sections that make up myofibrils called?

• Filaments

• Sarcomeres

• Z lines

• M lines

Which two main protein filaments are found in sarcomeres?

• Actin and Keratin

• Myosin and Collagen

• Actin and Myosin

• Collagen and Elastin

Which part of the sarcomere contains only actin filaments?

• A band

• H-zone

• I band

• M-line

What is the role of the Z-line in a sarcomere?

• It anchors the myosin filaments.

• It marks the boundary between adjacent sarcomeres.

• It is the central part of the A band.

• It is the area where actin and myosin overlap.

Which is not a term associated with muscles.

• Myofibril

• Sarcoplasm

• Atherosclerosis

• Striated

What is the thick filament found in a sarcomere?

• Actin

• Myosin

• Troponin

• Tropomyosin

What are the two parts of a myosin molecule?

• Myosin tail and myosin head

• Myosin arm and myosin leg

• Myosin core and myosin shell

• Myosin base and myosin tip