Manganese ions block the calcium channels in the cardiac muscle membrane. How would the presence of manganese in the extracellular fluid affect the contraction of the heart muscle?
A) The refractory period would be shorter.
B) The plateau phase of contraction would be longer.
C) The contraction phase would be prolonged.
D) The heart rate would increase.
E) The heart would beat less forcefully.
E) The heart would beat less forcefully.
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