Q18 / 160 · AP EAMCET 2021 (24 Aug Shift 1) · Chemistry

Which of the following metal ion plays an important role in muscle contraction?

  • A
    $\mathrm{Fe}^{2+}$
  • Correct answer
    B
    $\mathrm{Ca}^{2+}$
  • C
    $\mathrm{Au}^{+}$
  • D
    $\mathrm{Na}^{+}$

Solution

In muscle contraction, calcium ions $\mathrm{Ca}^{2+}$ play an important role by building interactions between proteins, myosin and actin. The $\mathrm{Ca}^{2+}$ ions bind to the $C$ portion of actin filament, exposing binding region to which myosin head is attached to in order to stimulate muscle contraction.

Hence, the correct answer is option: 'B'.

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