Figure shows schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function/s.

  • Option 1)

    D - Dorsal aorta - takes blood from heart to body parts, PO2 = 95 mm Hg

  • Option 2)

    A - Pulmonary vein - takes impure blood from body parts, PO2 = 60 mm Hg

  • Option 3)

    B- Pulmonary artery -takes blood from heart to lungs, PO= 90 mm Hg

  • Option 4)

    C - Vena Cava - takes blood from body parts to right auricle, PCO= 45 mm Hg

 

Answers (1)

 

Functioning of the heart -

To begin with, all the four chambers of heart are in a relaxed state, i.e., they are in joint diastole.

- wherein

As the tricuspid and bicuspid valves are open, blood from the pulmonary veins and vena cava flows into the left and the right ventricle respectively through the left and right atria.

 

 

Partial pressures of these O2 and CO2 in the atmospheric air and the other sites of diffusion -

Atmospheric Air

 

- wherein

O2 : 159

CO2 : 0.3

 

 Systemic view or vena cava carries blood from tissue to right arteries


Option 1)

D - Dorsal aorta - takes blood from heart to body parts, PO2 = 95 mm Hg

incorrect

Option 2)

A - Pulmonary vein - takes impure blood from body parts, PO2 = 60 mm Hg

incorrect

Option 3)

B- Pulmonary artery -takes blood from heart to lungs, PO= 90 mm Hg

incorrect

Option 4)

C - Vena Cava - takes blood from body parts to right auricle, PCO= 45 mm Hg

correct

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