The circulatory system carries blood الدم andيحملdissolved substances الذائبة to and from الموادdifferent 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 vessels الدموية . األوعية
The Heart and blood vessels الدموية makeاالوعيةupيكونوا the Circulatory System.
What is the circulatory system?
The heart is surrounded by بـ the محاطmyocardium التامور . غشاء
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.
3. Protecting يحمي the body.
2. Controlling body temperature.
lungs
head & arms
liver
digestive system
kidneys
legs
pulmonary artery
aorta
pulmonary vein
main vein
Left Right
How does this system work?
Circulatory System
Lungs
Body cells
Our circulatory system is a double circulatory system.
This means it has two parts.
the right side of
the system
deals with
deoxygenated
blood.
the left side of
the system
deals with
oxygenated
blood.
The double circulatory system
oxygenated blood to the rest of the body through the arteries
deoxygenated blood back to the heart through the veins.
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.
The systemic circulation carries:
lungs
body’scells
• 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
The Heart
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,
التاجية the الشرايينhearts own
blood supplyThe heart has four chambers
2 atria
2 ventricles
now lets look inside the heart
The Heart
Left Ventricle
االيسر البطين
Left Atrium
االيسر االذين
Right Atrium
Right Ventricle
Vein from Lungs
Artery to Head and BodyArtery to Lungs
Vein from Head and Body
Here are some other important parts of the heart:
The semi-lunar valves
Bicuspid (mitral) valveTricuspid
valve
• 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.
cardiac muscle
How does the Heart work?
blood from the body
blood from the lungs
The heart beat begins when the
heart muscles relax and blood
flows into the atria.
STEP ONE
The atria then contract and
the valves open to allow
blood
into the ventricles.
How does the Heart work?
STEP TWO