The picture above gives a representation of what the general circulatory system looks like.
Atherosclerosis
Atherosclerosis is where the arteries in your heart harden. This is caused when you eat on a high fat diet which leads to fatty plagues lining the blood vessels. Those areas become hard leading to atherosclerosis. Once the blood vessels are not as stretchable, blood pressure rises which can lead to heart and kidney damage and strokes.
The picture above shows what it's like with a healthy artery and what it's like with atherosclerosis. On the left it shows a normal healthy artery with a regular blood flow. On the left it shows an artery with atherosclerosis. You can see the plaque forming on the artery wall that's causing a change in blood flow.
The circulatory system is made up of the heart, veins, capillaries , arteries, and works closely with the Lymphatic System. It is also made of muscular, connective, nervous, and epithelial tissue. The cardiovascular system is in your circulatory system and is made of your heart, veins, capillaries, and arteries. The heart has three main parts. The Atria, the Ventricles, and the Valves. The Atria are the upper chambers of the heart while the Ventricles are the lower chambers. The Valves prevent blood from flowing backwards. The circulatory system works with the respiratory system in a process called circulation. The lungs receive oxygen poor blood and send out oxygen rich which goes through some of the heart and is sent out to the body. Arteries carry blood away while veins carry blood to the heart. Capillaries allow exchange of materials between blood and cells. The heartbeat is the sound of valves closing. Blood Pressure is the level of blood pressing on the artery walls as the heart beats. Overall, the circulatory system helps you maintain homeostasis by delivering materials to your body.