Arrange the following list of biochemical events in the correct sequence.
(1) An action potential is conducted deep into the muscle fiber by the T tubule.
(2) Calcium ions bind to troponin.
(3) The membranes of the sarcoplasmic reticulum become more permeable to calcium ions.
(4) Calcium ions diffuse into the sarcoplasm around the myofibril.
(5) The troponin-tropomyosin complex moves exposing active sites.

Question

Quizplus · Accepted Answer

The correct sequence starts with an action potential being conducted into the muscle fiber by the T tubule (1), which then causes the sarcoplasmic reticulum to become more permeable to calcium ions (3). Calcium ions then diffuse into the sarcoplasm around the myofibril (4), bind to troponin (2), which finally leads to the movement of the troponin-tropomyosin complex, exposing active sites on the actin filament for muscle contraction (5).

Arrange the Following List of Biochemical Events in the Correct