When the right atrium contracts, the
right ventricle always contracts simultaneously.
left atrium always contracts simultaneously.
left atrium always relaxes simultaneously.
left atrium and left ventricle always relax simultaneously.
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left atrium always contracts simultaneously.
When the right atrium contracts, the right ventricle always contracts simultaneously.
To understand this, we need to have a basic understanding of the anatomy of the heart. The heart has four chambers: the right atrium, the right ventricle, the left atrium, and the left ventricle. Blood enters the heart from the body via the right atrium and the left atrium.
The right atrium receives deoxygenated blood from the body and contracts to pump this blood into the right ventricle. The right ventricle then contracts to pump this deoxygenated blood into the lungs for oxygenation. This process is known as pulmonary circulation.
Simultaneously, the left atrium receives oxygenated blood from the lungs and contracts to pump it into the left ventricle. The left ventricle is responsible for pumping this oxygenated blood to the rest of the body through a network of arteries. This process is known as systemic circulation.
Therefore, when the right atrium contracts, it pumps blood into the right ventricle. These contractions occur simultaneously because they are part of the same cycle of blood circulation. The left atrium and left ventricle, on the other hand, are responsible for a different type of circulation.