What ion needs to be released from an endoplasmic reticulum in order for muscles to contract?
A) sodium
B) calcium
C) phosphorous
D) oxygen
E) nitrogen

Question

Quizplus · Accepted Answer

The ion that needs to be released from the endoplasmic reticulum in order for muscles to contract is calcium. Calcium ions bind to a protein called troponin, which causes a shift in the positioning of the protein complex regulating muscle contraction (actin and myosin). This ultimately leads to muscle fiber contraction.

What Ion Needs to Be Released from an Endoplasmic Reticulum