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Sarcomere Structure and Contractile Proteins Quiz

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Sarcomere Structure and Contractile Proteins Quiz

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Questions and Answers

What are the two regulatory proteins that regulate actin in a sarcomere?

Troponin and tropomyosin

Which proteins hold adjacent myosin together with supporting proteins in a sarcomere?

Actin

What is the main function of troponin in muscle contraction?

It binds to tropomyosin and can move it out of the way

Describe the arrangement of myosin and actin within a myofibril.

They are tightly packed and organized in a specific overlapping pattern Signup and view all the answers

What happens to the sarcomere when muscle contracts?

It shortens Signup and view all the answers

What causes muscle contraction at the microscopic level?

Depolarization of the muscle cell Signup and view all the answers

What is the boundary of a sarcomere where actin attaches to adjoining sarcomeres?

Z-line Signup and view all the answers

What is the space between myosin filaments that contains only actin?

I band (light band) Signup and view all the answers

Which protein binds to actin and blocks the myosin binding sites on actin?

Tropomyosin Signup and view all the answers

What is the dark band that stretches end to end of myosin, containing both actin and myosin filaments?

A band (dark band) Signup and view all the answers

Which protein contains binding sites for actin and an ATPase site?

Myosin Signup and view all the answers

What is the arrangement of overlapping contractile proteins, actin and myosin within a myofibril?

Sarcomere Signup and view all the answers

What is the role of troponin in muscle contraction?

Troponin binds to calcium, releasing tropomyosin from actin. Signup and view all the answers

Describe the process of myosin binding to actin during muscle contraction.

Myosin heads grab onto actin, forming a crossbridge. Signup and view all the answers

What happens when calcium is released in muscle cells?

Calcium binds to troponin, leading to the release of tropomyosin from actin. Signup and view all the answers

What is the function of tropomyosin in muscle contraction?

Tropomyosin covers the myosin binding sites on actin. Signup and view all the answers

Why is ATP required in muscle contraction?

ATP is needed for the power stroke of myosin, cross bridging release, and myosin detachment from actin. Signup and view all the answers

How does the sarcoplasmic reticulum contribute to muscle contraction?

It stores and releases calcium for muscle cell contraction. Signup and view all the answers