Circulatory System

GOAL of The Day

Understand how the lungs and the heart work together to transport oxygen rich blood to cells

Components of Blood

• About 55% of blood is a liquid called plasma.– Contains proteins, minerals, and

other substances.

• Red blood cells carry oxygen from the lungs to the cells.

• White blood cells fight infection.• Platelets are important for

clotting blood.

Flow of Blood through the heart

1. Blood that is low in oxygen flows from veins into the right atrium

2. The right atrium sends this blood to the right ventricle

“LUBB”• When the atrium contracts and pushes blood into

the ventricle, the closing of the valve produces this sounds

“DUBB”• When the ventricle pushes blood into the arteries, the

closing of the valve produces this sounds

3. The right ventricle sends the blood to the two lungs so that it can be enriched with oxygen

4. The oxygen-rich blood moves back from the lungs to the heart and enters the left atrium

5. The left atrium sends this blood to the left ventricle5

6. The left ventricle sends oxygen-rich blood to the whole body through the arteries