Circulatory System

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Slide 1

Circulatory System

S. MORRIS 2006

Slide 2

The circulatory system carries blood and dissolved

substances to and from different places in the body.

The Heart has the job of pumping these things around

the body.

The Heart pumps blood and substances around the

body in tubes called blood vessels.

The Heart and blood vessels together make up the

Circulatory System.

What is the circulatory system?

Slide 3

lungs

head & arms

liver

digestive system

kidneys

legs

pulmonary artery

aorta

pulmonary vein

main vein

Left

Right

How does this system work?

Circulatory System

Slide 4

Our circulatory system is a double circulatory system.

This means it has two parts parts.

the right side of the system

deals with deoxygenated blood.

the left side of the system

deals with oxygenated blood.

Slide 5

The Heart

These are arteries. They carry blood away from the heart.

This is a vein. It brings blood from the body, except the lungs.

Coronary arteries, the hearts own blood supply

The heart has four chambers

2 atria

2 ventricles

now lets look inside the heart

Slide 6

The Heart

Left Ventricle

Left Atrium

Right Atrium

Right Ventricle

valve

Vein from Lungs

Artery to Head and Body

Artery to Lungs

Vein from Head and Body

valve

Slide 7

How does the Heart work?

STEP ONE

Slide 8

How does the Heart work?

STEP TWO

Slide 9

How does the Heart work?

The cycle then repeats itself.

STEP THREE

Slide 10

blood from the heart gets around

the body through blood vessels

There are 3 types of blood vessels

a. ARTERY

b. VEIN

c. CAPILLARY

Slide 11

The Artery

thick muscle and elastic fibres

Arteries carry blood away from the heart.

the elastic fibres allow the artery to stretch under pressure

the thick muscle can contract to push the blood along.