6. Angina Pectoris is due to(a) defective nutrition(b) chest pain due to an inadequate supply of oxygen to the heart muscle
6. Angina Pectoris is due to(a) defective nutrition(b) chest pain due to an inadequate supply of oxygen to the heart muscle

(c) defective functioning of mitral valve
(d) infection by a virus

Correct option – ( b )

Explanation – chest pain due to an inadequate supply of oxygen to the heart muscle is called as angina pectoris . Oxygen supply is hampered when blood supply is reduced .

Hence correct answer is – chest pain due to an inadequate supply of oxygen to the heart muscle