1. Heart:

The heart is like a pump in your chest.

It has four rooms: two at the top (atria) and two at the bottom (ventricles).

2. Blood Vessels:

Arteries are like highways carrying oxygen from the heart to the body.

Veins are like return highways bringing used blood back to the heart.

Capillaries are tiny roads connecting the highways and letting stuff (like oxygen and nutrients) go in and out.

3. Blood:

Blood is like a delivery system.

Red blood cells deliver oxygen, white blood cells fight germs, and platelets help with healing.

Plasma is like the liquid that carries everything.

How it Works:

The heart pumps blood, sending oxygen and nutrients throughout your body.

Blood vessels act like roads, taking the blood where it needs to go.

At the tiny capillaries, the good stuff goes into your body's cells, and waste goes back into the blood.

Why it's Important:

Oxygen and nutrients keep your body working properly.

Waste gets carried away so your body stays clean.

It helps regulate your body temperature.

In short, your heart pumps blood through vessels to deliver good stuff and pick up the bad stuff, keeping your body running smoothly.