During muscle contraction Ca++ is released from the sarcoplasmic reticulum. What is this Ca++ doing? A. The Ca++ is binding to the actin. This results in the release of tropomyosin from the myosin-binding sites on actin. B. The Ca++ is binding to the troponin complex. This results in the release of troponin I from the complex, allowing tropomyosin to slide away from the myosin-binding sites on actin. C. The Ca++ is binding to the troponin complex. This results in the binding of troponin I to the complex, positioning tropomyosin over the myosin-binding sites on actin. D. The Ca++ is binding to the tropomyosin complex. This results in the release of tropomyosin from the complex, allowing troponin to slide away from the myosin-binding sites on actin.
Added by Anna D.
Step 1
Step 1: Calcium is released from the sarcoplasmic reticulum during muscle contraction. Show more…
Show all steps
Your feedback will help us improve your experience
Sri K and 85 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
The role of $\mathrm{Ca}^{2+}$ in the control of muscle contraction is to a. cause depolarization of the T tubule system. b. change the conformation of troponin, thus exposing myosin-binding sites. c. change the conformation of myosin heads, thus causing microfilaments to slide past each other. d. bind to tropomyosin and break actinmyosin cross-bridges. e. block the ATP-binding site on myosin heads, enabling muscles to relax.
Binding of $\mathrm{Ca}^{2+}$ with $\quad$ in the skeletal muscles and leads to the exposure of the binding site for $\quad$ on the filament (a) Troponin, myosin, actin (b) Troponin, actin, relaxin (c) Actin, myosin, troponin (d) Tropomyosin, myosis, actin
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD