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Muscle Contraction Mechanism Quiz

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What causes a conformational change in troponin?

Ca++ not binding to troponin

Movement of the entire troponin-tropomyosin complex (correct)

ADP & Pi binding to troponin

ATP binding to troponin

During crossbridge cycling, what provides energy to 'cock' the myosin head?

Tropomyosin exposing the myosin-binding site

Reset of the myosin head (correct)

Myosin binding to actin

Ca++ splitting into ADP & Pi

When myosin heads attach to the exposed binding sites on actin, what is the result?

Ca++ moves away from the troponin

Troponin covers the myosin-binding site

ATP binds to the myosin head

Tropomyosin is released from the myosin-binding site (correct)

What is the result of ADP & Pi release during a power stroke?

Myosin heads bind to actin (A) Signup and view all the answers

What is the consequence of Ca++ & ATP absence during cycling?

Cycling being unable to continue (D) Signup and view all the answers

What toxin leads to spastic paralysis known as tetanus?

Botulinum toxin (C) Signup and view all the answers

Muscle Contraction Mechanism Quiz

Choose a study mode

Podcast

Questions and Answers

What causes a conformational change in troponin?

During crossbridge cycling, what provides energy to 'cock' the myosin head?

When myosin heads attach to the exposed binding sites on actin, what is the result?

What is the result of ADP & Pi release during a power stroke?

What is the consequence of Ca++ & ATP absence during cycling?

What toxin leads to spastic paralysis known as tetanus?

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