"as their name suggests, calcium ion channel blockers block calcium ion channels in the sarcolemma of pacemaker and contractile cardiac muscle cells and slow calcium ion entry into the cell during an action potential. what effects would these drugs have on the myocardial cells? "

There would be a decrease in contractility

Explanation:

Since the calcium ion channel blockers slow down the calcium ion and they do not affect the potassium ion efflux which thus leads to a quick repolarization of the cell. This causes the muscle cell to lose the ability to sustain the excitability needed to keep it in a contracted state.  

answer; i believe that the correct answer is rapid and subsequently slow down;

they encountered severe weather for which they were poorly prepared.