NEET BIOLOGY

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HUMAN PHYSIOLOGY

BODY FLUIDS AND CIRCULATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A labeled red blood corpuscle is released into the arterial circulation in the left leg. It is recaptured 30 seconds later in the left lung. What is the minimum number of chambers of the heart it must have passed through?
A
0
B
1
C
2
D
3
Explanation: 

Detailed explanation-1: -RBCs pass through the heart two times in their journey from the hepatic artery to the aorta.

Detailed explanation-2: -After entering left atrium of heart, it will be transported to lungs for receiving oxygen. Then it will go into right chamber of heart and will be transported back to liver through aorta and then hepatic artery. Thus, from the above discussion it is clear that red blood cells enter the heart twice in its journey.

Detailed explanation-3: -It passes through the tricuspid valve to the right ventricle from the right atrium.

Detailed explanation-4: -Red blood cell arrives from the inferior vena cava into right atrium before it passes through the tricuspid valve into right ventricle. It then passes through the pulmonary valve into pulmonary artery before travelling through the lungs and back into the heart, this time the left atrium via the pulmonary vein.

There is 1 question to complete.
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