The opening of pulmonary vein is without valve because

Pulmonary vein carries

Pulmonary vein carries:

The opening of pulmonary arch into right ventricle of rabbit is guarded by _________ semilunar valves.

In the human heart, the I. left auricle has opeining of pulmonary veins and receives oxygenated blood from lungs. II. Right auricle opens into the right ventricle and the auriculoventricular aperture is guarded by a bicuspid valve. III. valves are attached to the wall of ventricles by means of chordae tendinae. IV. opening of left auricle into left ventricle is guarded by a tricuspid valve. Choose the correct answer.

The opening of the pulmonary artery and Aorta are guarded by three .......... valves.

What will happen if pulmonary veins are tied with a thread?

The opening of urethra is controlled by a valve.

Pulmonary veins are those which :-