The valve situated between the left atrium and the left ventricle is called
(1) Bicuspid valve (2) Tricuspid valve (3) Mitral valve (4) Eustachian tube
1 and 3 are correct.
The atrioventricular opening between the left atrium and the left ventricle is guarded by the bicuspid valve which is also called the mitral valve.
The right atrioventricular opening is guarded by the tricuspid valve.
The opening of the inferior vena cava is guarded by the Eustachian valve.