While your friend's parent are ok to give alcoholic drinks to their kids and to you, maybe your parents aren't ok with having you a drink.
The answer is C :) I hope this helps!
Answer: Refractory period of the cardiac action potential
Explanation:
Unlike the skeletal muscle which can be reactivated before it reaches a contraction, cardiac muscle must wait before it is almost completely relaxed to be activated again (because of its long refractory period), so one cannot make an increase in strength of contraction with a high frequency of stimulations.
Viral, bacterial, fungal, communicable? I know three not sure on the fourth one sorry
