Question
With which of the following molecules does $\mathrm{Ca}^{2+}$ bind after itsrelease from the sarcoplasmic reticulum to regulate musclecontraction?(A) $\quad$ Myosin(B) Actin(C) $\quad$ Troponin(D) $\quad$ Tropomyosin
Step 1
- Calcium ions are released from the sarcoplasmic reticulum in response to a nerve impulse, and they bind to specific proteins in the muscle cell to initiate the contraction process. Show more…
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The function of $\mathrm{Ca}^{2+}$ in skeletal muscle contraction is to a. cause an allosteric change in myosin so it detaches from actin. b. provide the energy necessary for the movement of the cross-bridge. c. expose the myosin-binding sites on the thin filaments. d. bind to tropomyosin. e. do a and c only.
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 actin-myosin cross-bridges. e. block the ATP-binding site on myosin heads, enabling muscles to relax.
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 actin-myosin crossbridges. $e .$ block the ATP binding site on myosin heads, enabling muscles to relax.
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