Question

The diagram given alongside represents the human heart in one phase of its functional activities. Study the same and answer the questions that follows.
Draw well-labelled diagrams of part A and B to show the structural differences between them.

Answer 1

$A$. Pulmonary artery:

• Thick, elastic and more muscular walls.
• Narrower lumen with no valves.

$B$. Superior vena cava

• Thin, non-elastic, less muscular walls.
• Wider lumen with valves.