What increases the contraction of the left ventricle? Is't the calcium

[Serenely_Dreaming]

channel blockers or the beta blockers? and which one relaxes the heart?

[doctor+]

beta-blockers are used to treat high blood pressure(hypertension),
congestive heart failure(chf),abnormal heart rhythms,and chest pain.beta-blockers are sometimes used in heart attack patients to prevent future heart attacks.
calcium channel blockers slow the rate at which calcium passes into the heart muscle and into the vessel walls. This relaxes the vessels. The relaxed vessels let blood flow more easily through them, thereby lowering blood pressure.