COTE oneshot and reaction change

This is my proper answer.

I already know that the heart was known for pumping blood but.

I have another answer about this.

I know you won't agree with my answer but, my answer is lungs because I think lungs not only pump oxygen and carbon dioxide, they also pump blood and it's just our heart is the organ that prevents blood (oxygenated) that returning to the lungs or pulling back since our heart has 4 valves, except for blood that is outside the heart that into the heart. 

When we breathe, our lungs get to expand and suck not only has from outside but our blood, and when we exhale, the lungs also push our blood, the heart just prevents our blood (oxygenated) from returning to its source.  the only blood that can be drawn by blood is non oxygenated.

We inhale and exhale fast as heart but the heart was still the fastest.

I hope you understand my answer.

Simple word

When lungs go expand, it pulls the gas and it also pulls blood, so that's why there was a heart to prevent the blood from coming back, except for nonoxygenated.

When our lungs return to themselves immediately, we exhale the gas from our body and push the blood(oxygenated) towards the heart.

Use the small plastic bottle as a lung quiz gently and put the gap in the water.

Once the bottle the water, let's the bottle return to normal states and you see the result.

It's also okay if you use a baseball bat, with no cover on it. Make some hole on it and don't worry because even it was have a hole,  it will still have air since it was small, unlike some big balls.

Once your baseball has small now, squeeze it and put it in the water (on a plate) with the hole was touching the water. After that, gentle remove your squeezes at the ball and you will see the tricks. After the ball has water, squeeze the ball to remove the water.

So, when blood circulation, our lungs are also involved in the scene.

And if you answer about if the lungs also pulling the blood, why didn't go inside the lungs?

Well, my answer is our heart has a filter on it to prevent blood from entering, and our oxygenated looks like a jelly when our none originated was looked like water.

Let's experiment!

You only need is

get a hose like this. 

or like this

as long as the hose gap is small, the hose represents our blood vessel. And not too long.

Then soften one part of the hose because it will represent our heart and valves and when you use a soft hose, don't soften it anymore.  then, glue the ends of the hose to each other, drill a small hole in its vicinity, and line with a small circle of paper as a representation of our blood cell.  I cover the hole with a piece of haircut from the mosquito net and it is like a filter in our blood vessel or hose. 

Then, pick some air pump for a bike like this

Need a small air pump for this for not you taking a hard.

It's better if it has a double hose because one hose sticks to the hose as our blood vessel and let's ignore the other hose as representing our windpipe.

But, if you don't have that well, it's okay.

Sticks the hose of an air pump for a bike to the hole of our hose that represents as out blood vessel, covers it with duck tape to prevent it from losing its grip.

Let's start the experiment.

Grab the soft part of the hose as represent our heart with your left hand use your right hand and grab the air pump for the bike as represent our lungs.

Make sure the small circle of paper was far away from the heart and lungs.

After that, pull the trigger of the air pump as represent inhaling, and when the paper

And when the small circle paper was pulled by the air pump, squeeze the soft part of hose as represent of heart and valves being close.

Example.

This is only my opinion, and it's not a fast answer.

So, the still answer for this was still a heart, not the liver because the liver was the organ that cleanses the blood and releases juice in our small intestine after we digest food.

They still answer was heart