The Circulatory System
                     THE 
CIRCULATORY 
SYSTEM
Introduction
The circulatory system 
(cardiovascular system) pumps 
blood from the heart to the lungs 
to get oxygen. The heart then 
sends oxygenated blood through 
arteries to the rest of the body.
Source: my.clevelandclinic.org
How it works?
The veins carry oxygen-poor 
blood back to the heart to start 
the circulation process over. Your 
circulatory system is critical to 
healthy organs, muscles and 
tissues.
Source: my.clevelandclinic.org
What is the 
circulatory system?
Your heart and blood vessels 
make up the circulatory system. 
The main function of the 
circulatory system is to provide 
oxygen, nutrients and hormones 
to muscles, tissues and organs 
throughout your body. 
Source: my.clevelandclinic.org
Heart pumps blood 
Your heart pumps blood to the 
body through a network of 
arteries and veins (blood vessels). 
Your circulatory system can also 
be defined as your cardiovascular 
system.
Source: my.clevelandclinic.org
FUNCTION
The circulatory system’s function 
is to move blood throughout the 
body. This blood circulation keeps 
organs, muscles and tissues 
healthy and working to keep you 
alive.
Source: my.clevelandclinic.org
Get rid of waste 
products
• Carbon dioxide from respiration 
(breathing)
• Other chemical byproducts from 
your organs
• Waste from things you eat and 
drink
Source: my.clevelandclinic.org
Circulatory system 
parts
• Heart, a muscular organ that 
pumps blood throughout your 
body
• Blood vessels, which include 
your arteries, veins and 
capillaries
• Blood, made up of red and white 
blood cells, plasma and platelets
Source: my.clevelandclinic.org
Blood vessels
• Arteries: Arteries are thin, muscular tubes 
that carry oxygenated blood away from 
the heart and to every part of your body. 
• Veins: These blood vessels return oxygen-
depleted blood to the heart. Veins start 
small (venules) and get larger as they 
approach your heart.
• Capillaries: These blood vessels connect 
very small arteries (arterioles) and veins 
(venules). 
Source: my.clevelandclinic.org
How to prevent 
circulatory system 
problems
• Aim for at least 150 minutes of 
physical activity every week
• Eat a heart-healthy diet rich in 
vegetables and fiber and low in 
saturated fats and processed 
foods
• Find healthy ways to ease stress
• Maintain a healthy weight
Source: my.clevelandclinic.org
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