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.

A) 1, 5, 2, 3, 4
B) 1, 3, 4, 2, 5
C) 1, 2, 3, 4, 5
D) 1, 3, 2, 5, 4
E) 1, 4, 3, 2, 5

Biochemical Events

Processes at the molecular level in living organisms, including reactions involved in metabolism, signal transduction, and gene expression.

T Tubule

Tubular extensions of the plasma membrane in muscle cells, specifically skeletal and cardiac muscle cells, which facilitate rapid transmission of action potentials and ensure coordinated muscle contraction.

Calcium Ions

Positively charged calcium atoms that are crucial for many physiological processes including muscle contraction, nerve function, and blood clotting.