Question

To reach the left side of heart the blood must
pass through
(a) sinus venosus (b) kidneys
(c) liver (d) lungs

Answer 1

To reach the left side of the heart the blood must pass through lungs

• Option (d) is correct.
• The impure blood (or the de-oxygenated blood) reaches the right side of the heart from the systemic circulation.  
• From the right side of the heart, the blood is carried to the lungs for purification of blood (or the oxygenation).
• Then the pure blood is carried to the left side of the heart from the lungs.

Answer 2

To reach the left side of heart the blood must  pass through lungs.

Option (D) is correct.

Explanation:

• From systemic circulation the deoxygenated blood is passed to the right side of the heart.
• From heart it reaches into the the lungs to get oxygen and becomes oxygenated.
• From lungs oxygenated blood moves to the left side of the heart.
• Pulmonary vein carries oxygenated blood from lungs to the left atrium.

Thus to reach the left side of heart the blood must  pass through lungs.

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What is the function of Left Atrium?

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