Interesting Facts About The Circulatory System

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   Apa khabar semua? Saya harap anda semua sihat belaka sahaja. Hari ini saya ingin menceritakan tentang The Circulatory System. Tetapi dalam bahasa inggeris. Selamat membaca dan have fun!

  Changes Idea

Ibn al-Nafis explained how blood circulated

 Your heart, blood, and blood vessels make up your circulatory system. 

There have been several ideas about how the circulatory system works.

Around 2000 years ago, a Greek philosopher called Galen said that the heart made blood and pumped it to every part of the body, where it was used up. This explanation was excepted in Europe until the 1600s.

Then a doctor called William Harvey watched animal hearts beating. They pumped out massive amounts of blood. He realised new blood could never be made that fast. His new explanation was that the same blood must keep going round and round.

Years later Syrian manuscripts were translated and Europeans realised that an Islamic doctor, Ibn al-Nafis, had written more or less the same thing 350 years before Harvey's discoveries.

capillaries in other parts of your body

The Heart

Your heart is made of muscle. When it beats,the muscle contracts. Each heartbeat pumps blood through every part of your body. 

Your heartbeats around 100 000 times a day. It acts as a double pump, with two separate sides. One side of the heart sends blood to your lungs. The other sends blood to all the other parts of your body.

The blood leaves the heart through arteries and returns through veins. Between each artery and vein is a network of tubes called capillaries which have a very thin walls. These let substance move in and out of your blood.

Your heart is made of muscles

Bringing supplies

Your body needs energy to stay alive. Energy can't be stored. You release it when you need it using the chemical reaction called respiration.

Respiration needs glucose and oxygen.

Blood collects glucose from your small intestine and oxygen from your lungs. It delivers these esssential supplies to every part of your body, so they can all carry out respiration ti supply the energy they need.

Heart attack

Sam's heart has stopped beating. He's having a heart attack. The doctors are trying to save him. One squeezes his heart, pushing blood around his body until they can start his heart beating again. 

Heart attacks cause 1 in 8 deaths worldwide,but they are more common in some countries than others.

Sam was lucky. His heart restarted. It wasn't too badly damaged. About half of all people who have a heart attack live for 10 years.

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