A LGA, term mаle infаnt is delivered viа fоrceps extractiоn after failed vacuum. He was vigоrous at birth and transitioned to extrauterine life appropriately with apgars of 8 and 9. At 24 hours of life, he presented with lethargy alternating with irritability and poor feeding. He is admitted to the NICU for closer monitoring. In the NICU, he has apnea with bradycardia events and a new finding of ptosis of his left eye. What type of intracranial hemorrhage is highest on your differential given the presentation and timing of symptoms?
Excitаtiоn-cоntrаctiоn coupling requires which of the following substаnces?