Our heart is the vital organ that pumps BLOOD VESSELS to all parts of our body.

Our heart is made up of heart MUSCLES which allow it to pump blood continously to all parts of our body.

Blood flows through BLOOD VESSELS to get to different part of our body.

Our heart pumps the blood rich in OXYGEN to all part of our body. Our blood also transport DIGESTED food and WATER to all part of our body.

Our its way back to our HEART , blood passes on waste substances to same organs. These waste substances are eventually passed out from our body. When blood reaches our heart again, it is sent to the lungs where CARBON DIOXIDE is removed and WATER is taken in.

A heartbeat is a cycle of CONTRACTION and RELAXATION of our heart muscles.

Our heart rate depends on our AGE, HEALTH and the type of EXERCISE we are doing.

Common illnesses that affect the circulatory system include arteriosclerosis, demage in the heart or blood vessels, HYPERTENSION, anaemia and LEUKAEMIA.

Arteriosclerosis occurs when FAT collect on the inner walls of arteries, causing them to stiffen.

Hypertension leads ro other medical conditions such us heart attack, ANAEMIA and kidney failure.

Anaemia occurs when the number of RED BLOOD cell in our body is low.

Leukaemia occurs when WHITE BLOOD cells multiply abnormally.

Our circulatory system works very closely with all part of our body, especially the RESPIRATORY and CIRCULATORY system.