Question

In humans, which structure receives blood from the lungs?
A. Aorta
B. Pulmonary artery
C. Pulmonary vein
D. Renal vein
E. Femoral artery

Answer 1

Human circulatory system also called as blood vascular system consists of a muscular chambered heart, network of closed branching blood vessels and blood, the fluid which is circulated. The oxygentated is pumped into the lungs of humans.

Complete answer:
Heart is situated in the thoracic cavity in between the two lungs, slightly tilted to the left. It is the size of our fist.
Our heart has four chambers, two relatively small upper chambers called atria and two larger lower chambers called ventricles. A thin, muscular wall called the inter- atrial septum separates the right and left atria, whereas a thick- walled, the inter- ventricular septum, separates the left and right ventricles.
let us infer about the option:
1. AORTA-The blood from the heart to the rest parts of the body is usually supplied to this artery. The blood from the heart is left by an aortic valve which travels through an aortic valve which makes a cane- shaped curve that allows other major arteries to deliver oxygenated blood to the brain, muscles and to the other cells.
2. PULMONARY ARTERY- The blood pumped by the right ventricles enter the pulmonary artery, where the left ventricle pumps blood into the aorta. The oxygenated blood pumped into the pulmonary artery is passed on the lungs from where the oxygenated blood is carried by the pulmonary veins into the left atrium.
3. RENAL VEIN- These are the veins that carry deoxygenated blood from the kidney to the inferior vena cava. Both the left and the right veins run anterior to their corresponding renal arteries. In the kidney, the blood drains from peritubular plexuses that later form the interlobular veins which join together to form an arcuate vein. It drains into interlobular veins that merge to from a single renal vein.
4. FEMORAL ARTERY- It is the largest artery in the thigh and the main arterial supply to the thighs and the leg. It is the major supply of oxygenated blood to the lower limb. The common femoral artery forms as a continuation of the external iliac artery that lies below the inguinal ligament. Branching of this artery arises from the common femoral artery that include superficial circumflex artery, superficial epigastric artery and external pudendal artery.

So, the correct answer is option B, Pulmonary artery.

Note: All the vertebrates possess a muscular chambered heart. Fish have a 2 chambered heart with an atrium and a ventricle but mammals have 4 chambered hearts with two atria and 2 ventricles. In fish the heart pumps deoxygenated blood which is oxygenated by gills and later supplied. Whereas in mammals, oxygenated and deoxygenated blood is received by atria and passed on to the ventricles.