Question

Deoxygenated blood from wall of heart is carried by
A. Coronary sinus
B. Inferior vena cava
C. Superior vena cava
D. Pulmonary artery

Answer 1

Heart is a part of the circulatory system and it is a hollow, muscular organ which pumps oxygenated blood throughout the body and deoxygenated blood to the lungs. Color of human blood is bright red when oxygenated but darker red when deoxygenated. Red color is due to hemoglobin, to which oxygen binds.

Complete answer:
Mammalian heart is made up of four chambers and has complete double circulation. Blood passes twice through the heart to supply once to the body. It is a thick, muscular, reddish brown, mesodermal in origin, conical organ present in the mediastinal space of thoracic cavity between two pleura enclosing the lungs. Double circulation involves two circulations; Systematic or Greater circulation and Pulmonary or lesser circulation.
The four chambers are separated on two sides. Both sides contain atrium which receives blood into the heart and flows it into a ventricle, which performs pumping of the blood out of the heart. To prevent the backflow there is a separation (valves) between the atria and ventricle on each side of the heart. And the wall that separates the left and right side of the heart is called the septum.
The left heart performs systemic circulation, while the right heart performs pulmonary circulation. The receiving of the oxygenated blood is carried out by the left side of the heart from the pulmonary vein which pumps it into the aorta. Right side of the heart receives deoxygenated blood from the vena cava and pumps it into the pulmonary vein. From the walls of the heart, veins collect deoxygenated blood which is carried by coronary sinus and further into the right atrium of the heart. Deoxygenated blood is carried by inferior vena cava from the lower and middle body parts to the right atrium of the heart and from the upper body parts to the right atrium of the heart . The superior vena cava carries deoxygenated blood. Pulmonary artery collects the deoxygenated blood from the right atrium to the lungs.

So, the correct answer is a, coronary sinus.

Note: Every cell needs regular supply of nutrients. Oxygen etc. to provide energy for the growth and repair. Circulatory system is one of the most important systems for the proper functioning of the body as it helps to remove the carbon dioxide and ammonia, urea etc. from the body.
Muscular wall of the heart helps in contraction and dilation. Each contraction and relaxation is a heartbeat. Ventricular contractions (systole), force blood out of the heart through pulmonary and aortic valves. Diastole occurs when blood flows from atria to fill the ventricles.