Question

Which chamber of a bird heart does oxygen rich blood first enter?
A. Right atrium
B. Right ventricle
C. Left ventricle
D. Left atrium

Answer 1

Hint: Birds are theorized to have evolved from theropod dinosaurs. One of the most interesting characteristics of birds includes their ability to perform meticulous functions in extreme climates. For instance, they can soar at high altitudes, live in hot deserts, and dive deeply into cold waters.

Complete answer:
Birds have higher metabolic rates compared to mammals. Their cardiovascular system has the efficiency to achieve the metabolic requirements of flight, diving, swimming or running. The cardiovascular system delivers oxygen to blood cells and is also capable of maintaining the bird’s body temperature. The avian circulatory system transports nutrients, oxygen, carbon dioxide, heat, waste products, and hormones. The avian heart is present in the thoracoabdominal cavity’s cranial portion. Birds have a closed circulatory system. The chicken heart has four chambers- left atrium and ventricle, right atrium and ventricle. The left atrium and ventricle receive oxygenated blood from the lungs, which they pump into the body. The right atrium and ventricle collect the deoxygenated blood from the body and send it to the lungs. Therefore, the left atrium is the first valve in a bird’s heart to receive oxygen-rich blood.
Hence, the answer is option D. Left atrium.

Note: Humans consume many species of bird as food and to obtain raw material such as eggs, meat, feathers, etc. Since and even before the 17th century, about 120-130 species of birds have been recorded to have become extinct. Currently, about 1200 species are estimated to become extinct due to human activity. Natural reserves and organizations have taken it upon themselves to protect and prevent the bird from becoming extinct.