Question

The heart is a muscular organ that pumps blood. Blood that contains waste materials is brought to the heart by blood vessels. This blood enters the _____ and then moves down. The presence of the______ prevents the backflow of blood inside the heart

Answer 1

1: left atrium, right atrium, right ventricle.

2: atrioventricular valve, valves in the aorta, valves in the veins.

Answer 2

This blood enters the Right atrium, right ventricle and then moves down. The presence of the valves prevents the backflow of blood inside the heart.

Step-by-step explanation:

• The blood that contains water materials and is poor in oxygen content is brought by the blood vessels to the right atrium or the upper chamber of the heart.

• The blood then moves via the tricuspid valves to the right ventricles or the lower chamber. The presence of valves prevents the blood from flowing back. The valves also control the amount of blood flow in the heart.