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Sladkaya [172]
3 years ago
6

A doctor detects an irregularity in the first part of the heartbeat.

Health
1 answer:
Volgvan3 years ago
3 0

Answer:

• Valve between the left atrium and left ventrical.

Explanation:

The first part of the heartbeat occurs through the sound of the mitral and tricuspid valves closing. These valves are located between the right upper heart chamber (right atrium) and right lower heart chamber (right ventricle).

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