Question

question 8
which of the following is the correct sequence of blood flow in birds and mammals?
a left ventricle → aorta → lungs → systemic circulation
b vena cava → right atrium → right ventricle → pulmonary vein
c pulmonary vein → left atrium → left ventricle → pulmonary circuit
d vena cava → right atrium → right ventricle → pulmonary artery

Explanation:

• Option A: Incorrect. The aorta is part of the systemic circulation, not the path to the lungs. Blood from the left ventricle goes to the systemic circulation via the aorta, not to the lungs.
• Option B: Incorrect. After the right ventricle, blood goes to the pulmonary artery, not the pulmonary vein. The pulmonary vein brings oxygenated blood back to the heart.
• Option C: Incorrect. The left ventricle pumps blood to the systemic circulation, not the pulmonary circuit.
• Option D: Correct. Deoxygenated blood returns to the heart via the vena cava, enters the right atrium, then the right ventricle, and is pumped to the lungs via the pulmonary artery.

Answer:

D. vena cava → right atrium → right ventricle → pulmonary artery