Correct sequence of blood flow in birds and mammals?

 

Correct sequence of blood flow in birds and mammals

The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle through the tricuspid valve.

• The right ventricle pumps the oxygen-poor blood to the lungs through the pulmonary valve.
• The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle through the mitral valve.
• The left ventricle pumps the oxygen-rich blood through the aortic valve out to the rest of the body

Step-by-step explanation

Birds, like mammals, have a 4-chambered heart (2 atria & 2 ventricles), with complete separation of oxygenated and de-oxygenated blood. The right ventricle pumps blood to the lungs, while the left ventricle pumps blood to the rest of the body.The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle through the tricuspid valve

Blood is pumped from veins of the systemic circuit into the right atrium of the heart, then into the right ventricle. Blood then enters the pulmonary circuit, and is oxygenated by the lungs. From the pulmonary circuit, blood re-enters the heart through the left atrium.

The heart muscle pumps blood through three divisions of the circulatory system: coronary, pulmonary, and systemic. There is one atrium and one ventricle on the right side and one atrium and one ventricle on the left side. The pumping of the heart is a function of cardiomyocytes, distinctive muscle cells that are striated like skeletal muscle but pump rhythmically and involuntarily like smooth muscle. The internal pacemaker starts at the sinoatrial node, which is located near the wall of the right atrium. Electrical charges pulse from the SA node causing the two atria to contract in unison; then the pulse reaches the atrioventricular node between the right atrium and right ventricle. A pause in the electric signal allows the atria to empty completely into the ventricles before the ventricles pump out the blood. The blood from the heart is carried through the body by a complex network of blood vessels; arteries take blood away from the heart, and veins bring blood back to the heart.

Generally the order of flow of the blood is :

The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle through the tricuspid valve.

• The right ventricle pumps the oxygen-poor blood to the lungs through the pulmonary valve.
• The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle through the mitral valve.
• The left ventricle pumps the oxygen-rich blood through the aortic valve out to the rest of the body