Final answer:
The role of ionic calcium in muscle contraction involves binding with troponin and triggering cross-bridging with myosin heads to allow muscle contraction.
Step-by-step explanation:
The role of ionic calcium in muscle contraction involves several processes, but one of the options mentioned in the question is not a role of ionic calcium. Ionic calcium binds with troponin, triggering a conformational change that allows the actin-binding sites to be exposed and cross-bridging with myosin heads to occur. This ultimately leads to muscle contraction. However, the option that is NOT a role of ionic calcium in muscle contraction is C-activates epinephrine released from adrenal gland.