CIRCULATORY SYSTEM

Circulatory system transports nutrients, oxigen and residues

around the body

BLOOD

BLOOD VESSELSHEART

PLASMA. Which is water with different

substances dissolved in it. BLOOD CELLS:

RED BLOOD CELLS. Transport oxigen. WHITE BLOOD CELLSDefend us from infections PLATELETSBlock our wounds.

BLOOD

ARTERIES.

Transport the blood from the heart to the body. Their walls are thick and have muscles.

VEINS Transport the blood from the body to the heart Their walls are thin and they have valves inside

CAPILLARIES Connect the veins and arteries and reach all the

cells in our body. They are very small vessels.

BLOOD VESSELS

THE BLOOD VESSELS

It is a pump made by a special kind of muscle

fibres , called cardiac muscles . It is divided into two inconnected parts: the

right and the left. Each part is also divided into two parts:

The upper part is the auricle or atrium The lower part is the ventricle Both parts are connected by a valve

THE HEART

THE HEART

The blood can travel round by two

circulations. Pulmonary circulation Sistemic circulation Video about blood circulation

BLOOD CIRCULATION

Oxygen-rich blood

Carbon dioxide-rich blood

Lungs

Pulmonary vein

Left auricle

Left ventricle

Right ventricle

Right auricle

Pulmonary vein

1. Blood with carbon dioxide (oxygen-depleted blood), nutrients and waste substances from the heart, enters through the vena cava into the right ventricle.

Vena cava

Pulmonary artery

2. The blood is pumped through thepulmonary arteries to the lungs where it is oxygenated.

3. From the lungs, thepulmonary veinsreturn the oxygen-rich blood to the heart, where it enters the left auricule.

The pulmanory circulation

Left ventricleRight ventricle

AortaVena cava

Left auricleRight auricle

1. Oxygen-rich blood from the left ventricle is pumped out via the aorta and into the rest of the body.

2. The arteries branch out into capillaries that transport the oxygen and the nutrients to the cells of the body.

3. The oxygen-depleted blood flows back to the heart through the vena cavae: the pulmonary circulation starts again.

Oxygen-rich blood

Carbon dioxide-rich bloodThe sistemic circulation