This ion is transported by L-type channels, which are found in T-tubules.
The transport of this species is targeted by drugs in class IV of the Vaughan Williams classification. Increasing cellular levels of this species has a positive inotropic effect. Drugs like amlodipine target the transport of this species, and are derived from dihydropyridine. This ion is transported by L-type channels, which are found in T-tubules. Those channels close during the repolarization phase of a cardiac action potential. This ion is released by the (*) sarcoplasmic reticulum, and binds to troponin during muscle contraction. Parathyroid hormone causes more of this ion to be released into the blood, in part by activating vitamin D. For 10 points, name this metal that is mostly stored in bones.
The transport of this species is targeted by drugs in class IV of the Vaughan Williams classification.
calcium [accept Ca2+] &lt;RY, Biology&gt;