Is the heart made up of at least 3 types of cells

The human heart contains an estimated 2–3 billion cardiac muscle cells, but these account for less than a third of the total cell number in the heart.

Explanation:

the human heart Structure. There are two types of cells within the heart: the cardiomyocytes and the cardiac pacemaker cells. Cardiomyocytes make up the atria (the chambers in which blood enters the heart) and the ventricles (the chambers where blood is collected and pumped out of the heart).

There are three types of muscle tissue in the body: skeletal, smooth, and cardiac. Just the cardiac muscle itself contains many types of cells, including fibroblasts, smooth muscle cells, and cardiomyocytes.

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock