Question

part a what is the function of the structure indicated by the arrow? storage of calcium houses the genetic material (dna) of the cell making of energy (atp), \power house\ of the cell part of coupling the action potential to contraction

Explanation:

The structure indicated by the arrow is the sarcoplasmic reticulum in muscle cells, which is responsible for storing calcium ions. When a muscle receives a signal to contract, calcium is released from the sarcoplasmic reticulum to initiate the contraction - relaxation cycle.

Answer:

storage of calcium