Differences between Atria and Ventricles

Last Updated on March 19, 2022 by QCity Editorial Stuff

The heart has four chambers, two on the right and two on the left. The top chambers are called atria, while the bottom ones are called ventricles. Atria has thinner walls than ventricles but they hold more blood because of this. Ventricles contract to pump blood out of them, while atria push it up into them from the lungs. 

The human heart is a fascinating organ that does so much for us! For example, without it, we would not be able to live very long because there would be no way for our bodies to get oxygenated blood throughout our whole body! Read on if you’re interested in learning about how these specialized organs work together with other parts of your body to keep you alive and healthy.

Comparison between Atria and Ventricles

Parameters of ComparisonAtriaVentricles
WallThe atria are two thin-walled, ballooned chambers on the right and left sides of the heartVentricles are four large cavities in the walls of the heart that contain blood
PumpAtria contract to pump blood into ventriclesVentricles contract to push blood out into circulation
ChamberThe atria are the two upper chambers of the hearta thinner wall than ventricles do
Locatedatria are side by sideVentricles are located on top of each other
Connectedatria are side by sideit exits from the right ventricle

What is Atria?

The atrium is the upper chamber of the heart. The right atrium receives blood from the venae cavae and pumps it into the right ventricle, while the left atrium receives blood from pulmonary veins and pumps it into the left ventricle. 

Atria is the space in the heart, which receives blood pumped by the left ventricle. It is located between the septum and right ventricle. The atrial walls are thinner than those of other parts of the heart, so they can contract more easily to push blood into this space for distribution throughout your body. 

The atria help pump oxygen-rich blood through your circulatory system to all parts of your body while also removing carbon dioxide from it. Your two atria are separated into four chambers each, called auricles or auricular appendages that act like valves that keep one side’s flow separate from another’s. 

Differences between Atria and Ventricles

What is Ventricles?

The ventricular system is located in the interior of the brain and consists of four interconnected cavities. The ventricles are connected to both the cerebrospinal fluid (CSF) and blood circulatory system. Their function is to provide a cushioning effect for your brain, as well as produce CSF, which acts similarly to the cerebral spinal fluid found in other parts of your body. Ventricles can be seen on an MRI or CT scan by looking at slices through the back and front of the head. 

Ventricles are fluid-filled spaces in the brain, which are connected to the spinal cord. These chambers help regulate pressure and blood flow throughout the brain. Having too much or too little of either can cause serious problems for your health. Ventricles control how water moves through them via a process called osmosis, where molecules move from an area with high concentrations to one that has lower concentrations until both areas have similar levels of concentration. When ventricles don’t work properly it causes hydrocephalus, which is when excess cerebrospinal fluid builds up inside the skull and puts pressure on the organ itself. This pressure can cause many symptoms including drowsiness, headaches, nausea or vomiting, irritability, or aggression due to limb weakness.

Differences between Atria and Ventricles

10 Differences between Atria and Ventricles

1. The atria are two thin-walled, ballooned chambers on the right and left sides of the heart.

2. Ventricles are four large cavities in the walls of the heart that contain blood when it is pumped out to be circulated through the body.

3. Atria contract to pump blood into ventricles.

4. Ventricles contract to push blood out into circulation.

5. Blood flows from one atrium to one ventricle then moves back again before entering another ventricle, finally moving into an artery or vein that carries it away for delivery throughout the body.

6. A valve between each chamber prevents the mixing of oxygenated and deoxygenated blood.

7. The atria are the two upper chambers of the heart, and they have a thinner wall than ventricles do.

8. Ventricles are located on top of each other, while atria are side by side.

9. Aorta is connected to the left ventricle as it exits from the right ventricle.

10. For blood to be pumped out of the heart, pressure has to build up in both atria before any blood can exit.

Interesting Statistics or Facts of Atria

1. Atria is the largest not-for-profit provider of senior living communities in the United States.

2. In 2016, Atria had an operating income of $1.4 billion on revenues of $3.5 billion.

3. The average stay for a resident at an Atria community is 2 years and 3 months.

4. more than 19,000 employees are working for Atria worldwide.

5. Nearly 1 million people live in one of the communities managed by Atria Worldwide.

6. More than 30% of residents at an Atria community live independently without needing any assistance from staff members.

Interesting Statistics or Facts of Ventricles

1. The ventricular system is composed of two ventricles, the right, and left.

2. Ventricles are found in the brain’s cerebrum.

3. The shape of a ventricle is like an upside-down J or U.

4. Ventricles are important because they control blood flow to different parts of your body.

5. There are four chambers in each ventricle; these include two lateral cavities, one anterior cavity, and one posterior cavity.

6. Blood flows into the upper chamber (lateral) while it drains out from the lower chamber (posterior). This process helps regulate blood pressure within your body.


The atria and ventricles are two chambers in the heart. The left side of the heart contains four structures, including an upper chamber called the left atrium. This is where blood from your lungs first goes when it enters your body’s circulatory system. On that same side of the heart, there is a lower chamber called the left ventricle which pumps oxygen-rich blood to all parts of your body through arteries after it has passed through capillaries to pick up nutrients for cells throughout your body. As you might expect, on the right side of our hearts we find these same structures with one notable difference: they are reversed, so instead of being named “left” or “right” they are called “right” and “left.”.


Resource 01: https://www.atriaseniorliving.com/
Resource 02: https://emedicine.medscape.com/article/1923254-overview

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