Question

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Question
The main structural distinction between the left atrium and the right atrium is that the left atrium has the _____, and the right atrium does not.

(1 point)
Responses

auricle

auricle

pectinate muscles

pectinate muscles

cardiac muscles

cardiac muscles

chordae tendinae

chordae tendinae

Answer 1

The main structural distinction between the left atrium and the right atrium is that the left atrium has the **pectinate muscles**, and the right atrium does not.

However, both atria have auricles. Therefore, the correct answer is **pectinate muscles**.