Oral thrush is a yeast infection in the mouth caused by a fungus. It can cause a burning sensation on the tongue as well as sore white plaques that can be scraped off (although it may sometimes appear as a red patch).
Cardiac muscle is a type of involuntary striated muscle found in the walls and histological foundation of the heart, specifically the myocardium. Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle.
Definition of cardiac muscle. : the principal involuntary-muscle tissue of the vertebrate heart made up of striated fibers joined at usually branched ends and functioning in synchronized rhythmic contraction.