1. Circulatory System

2. What is the circulatory system?
The circulatory system carries blood يحمل الدمand dissolved substances المواد الذائبة to and from different places in the body.
The Heart has the job وظيفة of pumping ضخ these things around the body.
The Heart pumps blood and substances around the
body in tubesانابيب called تسمىblood vesselsالأوعية الدموية .
The heart is surrounded by محاط بـ the myocardiumغشاء التامور .
The Heart and blood vessels الاوعية الدمويةmake upيكونوا the Circulatory System.

3. Functions of the circulatory system
The circulatory system has three functions:
1. Transporting substances around the body. These include oxygen, glucose, carbon dioxide, nutrients, water and waste products.
2. Controlling body temperature.
3. Protecting يحمي the body.

4. How does this system work?
pulmonary vein
lungs
pulmonary artery
head & arms
aorta
main vein
Right
Left
liver
digestive system
kidneys
legs
Circulatory System

5. Our circulatory system is a double circulatory system.
This means it has two parts.
Lungs
Body cells
the right side of the system
deals with deoxygenated blood.
the left side of the system
deals with oxygenated blood.

6. The double circulatory system
The pulmonary الرئويcirculation carries:
deoxygenated blood from the heart to the lungsالرئتين
oxygenated blood back from the lungs to the heart, ready to be pumped out to the body.
lungs
body’s
cells
The systemic circulation carries:
Point out to students that the pulmonary vein is the only vein that carries oxygenated blood/ the pulmonary artery is the only artery that carries deoxygenated blood
oxygenated blood to the rest of the body through the arteries
deoxygenated blood back to the heart through the veins.

7. The Heart The heart contracts about 72 times per minute
Pumps about 70mL of blood with each contraction.
The right and left sides of the heart are separated by a septum, or wall.
The septum prevents the mixing of oxygen rich and oxygen poor blood.
septum

8. now lets look inside the heart
This is a vein. It brings blood from the body, except the lungs.
These are arteries. They carry blood away from the heart.
2 atria
Coronary arteries,
الشرايين التاجية the hearts own blood supply
2 ventricles
The heart has four chambers
now lets look inside the heart

9. The Heart Artery to Lungs Artery to Head and Body
Vein from Head and Body
Vein from Lungs
Right Atrium
Left Atrium
الاذين الايسر
Left Ventricle
البطين الايسر
Right Ventricle

10. Here are some other important parts of the heart:
The semi-lunar valves prevent expelled blood flowing back into the heart.
Bicuspid (mitral) valve and Tricuspid valve prevent blood flowing back into the atria from the ventricles.
The walls are made of cardiac muscle.
The semi-lunar valves
Bicuspid (mitral) valve
Tricuspid valve
cardiac muscle

11. How does the Heart work? STEP ONE blood from the lungs
blood from the body
blood from the lungs
The heart beat begins when the
heart muscles relax and blood
flows into the atria.

12. The atria then contract and
How does the Heart work?
STEP TWO
The atria then contract and
the valves open to allow blood
into the ventricles.

13. The cycle then repeats itself.
How does the Heart work?
STEP THREE
The valves الصماماتclose to stop blood
flowing backwards.
The ventricles contract تنقبضforcing
the blood to leave the heart.
At the same time, the atriaالشرايين are
relaxing and once again filling with
blood.
The cycle then repeats itself.