A type of medication that increases the tone of the heart is called a:

A) vasodilator.
B) vasopressor.
C) claudication.
D) cardiotonic.

Cardiotonic

A substance that increases the contractility of the heart muscle, improving its performance.

Vasodilator

A substance that causes blood vessels to expand, increasing blood flow; used in the treatment of conditions like hypertension.

Vasopressor

A type of medication that causes blood vessels to narrow, raising blood pressure.