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PELETEIRO BLOOD COMPOSITION

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3RD ESO

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biología 3rd eso blodd biology Âge recommandé: 14 ans
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PELETEIRO BLOOD COMPOSITION

3RD ESO

Carlos David García Gómez
1

heart viruses RED organs haemoglobin Capillaries Arteries oxygen plasma coagulate LEUKOCYTES three marrow direction nutrients white cells valves heart vessels organs platelets connective

Blood is a type of tissue formed by suspended cells in an intercellular liquid substance called .

Blood circulates through blood and transports and oxygen to the cells . It also removes CO2 and other waste products made by the body .

Blood is made up of plasma and blood cells : red blood cells , blood cells and . They are formed in the bone .
BLOOD CELLS , HAEMATITES OR ERYTHROCYTES
These are the most abundant cells . They contain , a complex protein which absorbs iron . Haemoglobin picks up from the lungs and transports it through the bloodstream to the capillaries , where it is released into the cells .
WHITE BLOOD CELLS OR
These protect us from infectious agents , such as bacteria , or parasites .
PLATELETS
These are fragments of cytoplasm produced by red bone marrow . They help ( clot ) blood .
Blood vessels make up a network that transports blood around the body . There are types of blood vessels .

are highly resistant elastic vessels that send blood from the to the . They maintain blood pressure .

Veins take blood from the to the . Their walls are less resistant so blood pressure is lower . They have to prevent blood flowing in the wrong .

, whose walls are formed by one single layer of endothelium , allow the exchange of substances between the blood and .