The heart pumps deoxygenated blood to the lungs. This means the blood going from the heart to the lungs has very little oxygen and is full of carbon dioxide.

Let’s break it down in easy words:
The heart has four chambers – two atria (upper) and two ventricles (lower). The right side of the heart collects deoxygenated blood from the body and then pumps it to the lungs through the **pulmonary artery**.

Why to the lungs? Because the blood needs to get fresh oxygen and remove the carbon dioxide. In the lungs:
- The blood releases carbon dioxide when we breathe out.
- It takes in oxygen when we breathe in.

After that, the now oxygen-rich blood returns to the left side of the heart and gets pumped out to the rest of the body.

Now, let’s understand the options:
- Lymph fluid: This is not blood, it’s part of another system.
- Oxygenated blood: This goes **from** lungs **to** the heart, not the other way.
- Atria blood: This is not a type of blood but refers to chambers.
- Deoxygenated blood: ✅ This is the correct type of blood that goes **from the heart to the lungs.**

✅ Final Answer: Deoxygenated blood.