Question

fill in the blank question
the heart valves consist of -lined fibrous connective tissue flaps called

Explanation:

Heart valves are composed of endocardium - lined fibrous connective - tissue flaps known as cusps. The endocardium is the inner - lining of the heart chambers and valves, and the cusps are the flap - like structures that open and close to regulate blood flow through the heart.

Answer:

endocardium; cusps