At which point, the pulmonary artery is different from the pulmonary vein:
1. Its lumen is broad
2. Its wall is thick
3. It has valves
4. It does not possess endothelium

Subtopic:  Human Heart: Double Circulation |
 69%
Level 2: 60%+
AIPMT - 2000
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Systemic heart refers to:
 

1. The heart that contracts under stimulation from the nervous system
2. Left auricle and left ventricle in higher vertebrates
3. Entire heart in lower vertebrates
4. The two ventricles together in humans
Subtopic:  Human Heart: Double Circulation |
 53%
Level 3: 35%-60%
AIPMT - 2003
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