NEET PG DENTAL EXAM

Detailed explanation-1: -Veins become larger and larger as they get closer to the heart. The superior vena cava is the large vein that brings blood from the head and arms to the heart, and the inferior vena cava brings blood from the abdomen and legs into the heart.

Detailed explanation-2: -In the venous system, constriction increases blood pressure as it does in arteries; the increasing pressure helps to return blood to the heart. In addition, constriction causes the vessel lumen to become more rounded, decreasing resistance and increasing blood flow.

Detailed explanation-3: -Your blood is pumped around your body through a network of blood vessels: arteries – they carry oxygen-rich blood from your heart to all parts of your body, getting smaller as they get further away from the heart.

Detailed explanation-4: -The brachiocephalic vein from each upper extremity will merge to form the superior vena cava. The superior vena cava drains into the right atrium of the heart.