Multiple choice

The oxygenated haemolymph entering the heart is isolated by __________.

  1. coronary sulcus

  2. pericardial sinus

  3. sternocostal surface

  4. fibrous pericardium

  5. serous pericardium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It refers to the wall at the back of the pericardial sac. It acts as a collection reservoir to isolate oxygenated haemolymph entering the heart.

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