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The Circulatory system and Blood (The 4 main components of blood (Red…
The Circulatory system and Blood
The 4 main components of blood
Red blood cells
Most of the cells in the blood are red blood cells
Unusually small cells
Why red?- contains red pigment called haemoglobin
White blood cells
Larger than red blood cells
Have nucleus
Help to fight against bacteria and viruses inside our body
Plasma
The liquid part of the blood
It is mostly water
Contains many different substances dissolved in it Ex: sugar is dissolved in blood plasma.
Platelets
Little fragment of cells
Involve in blood clothing
If a blood vessel gets damaged, the platelets help the blood to clot and seal the wound.
Our circulatory system consists of:
A system of tubes (arteries, veins and capillaries)
A pump (heart)
Valves- ensure a one-way flow of blood
Summary
The Pulmonary circuit and the Systemic circuit make up the circulatory system.
Blood flows out of the heart inside arteries, and back into the heart inside veins.
Blood picks up oxygen as it passes through the lungs, and releases oxygen as it passes through the tissues in the rest of the body
The 2 circuits in circulatory system
The Pulmonary circuit- Between the heart and the lungs
The deoxygenated blood is sent to the lungs. The blood is oxygenated there and then carried back to the
heart. The oxygenated blood is again pumped into our body
Systemic circuit- Between the heart and the other organs
Oxygen leaves the blood as the blood passes through
tissues where the cells are using up oxygen. The oxygen diffuses from the blood, into the body cells. when the blood loses most of its oxygen, it becomes more of the blueish-red. This is deoxgenated blood