Question

the heart is built up of...
connective, muscle, epithelial, and nerve tissues.
connective, muscle, and nerve tissues.
epithelial and muscle tissues.
muscle, epithelial, and nerve tissues.

Explanation:

The heart is a complex organ made up of connective tissue (for support), muscle tissue (cardiac muscle for contraction), epithelial tissue (lining), and nerve tissue (for regulation of heart - beat).

Answer:

connective, muscle, epithelial, and nerve tissues.