Red blood cells: Carry ___________ and ____________.

What is this?

When we do exercise, we need more _____________, so the heart beats _________._______.

Arteries: Carry ___________ from the ____________ to ______________in the rest of the body.

Blood enters the heart through the ____________ , then it flows into the _______________, where is pumped out. There are special flaps called ___________, that stop the blood from flowing backwards.

What is this?

What is this?

White blood cells: • They fight ____________. They attack any __________ or ___________ that enter the body.

What is the heart? Is a ____________ that _______________.

Plasma: carries __________ and ______________.

Platelets: • Are particles, to stop ____________, when there is a ____________.

Capillaries: Are tiny __________________ with very thin walls, so_____________ and other substances can pass through them easily.