blood is a tissue, it is made up of a liquid called plasma which has 3 different components it: red blood cells, white blood cells and platelets.
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Plasma
plasma transports various chemical substances around the body such as the products of digestion, hormones, antibodies, urea and carbon dioxide.
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Red blood cells
contains haemoglobin, which binds to oxygenate transport it from the lungs to the tissues and cells, which need it for respiration.
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Red blood cells
Do not contain a nucleus so more room for haemoglobin. Very small so they can fit through tiny capillaries. shaped like biconcave disks so large surface area-oxygen can quickly diffuse across.
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White blood cells
help protect the body against infection. Can change shape so they can squeeze out of the blood vessels surround and engulf microorganisms.
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Platelets
Platelets are fragments of cells, which collect at wounds and trigger blood clotting.
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Arteries
Take blood from your heart to your organs. Thick walls made from muscle and elastic fibres.
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Veins
Take blood from your organs to your heart. Thinner walls and have valves to prevent backflow.
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Capillaries
allow substances needed by the cells to be passed out of the blood. Allow substances produced by the cell to pass into the blood. One cel thick.
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The heart
The heart is a double circulatory system. Blood passes through the heart twice on each circuit. There are 4 chambers in the heart.
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The heart.
The 4 chambers are: The left and right atria, which receive blood from the veins. the left. and right ventricles which pump the blood out into the arteries.
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Gaseous exchange
The heart send blood to the lungs via the pulmonary artery. Air obtained by breathing reaches the lungs through the trachea which has rings of cartilage to stop it from collapsing.
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Gaseous exchange
The trachea divides into two tubes-the bronchi. The bronchi divides to form bronchioles. The bronchioles divide until they they end in tiny air sacs called alveoli.
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Gaseous exchange
There are millions of alveoli adapted for gas exchange- they have a large moist surface area. They have a very rich blood supply. They are very closest the blood capillaries so the distance for gas to diffuse is small.
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Gaseous exchange
The blood is taken back to the lungs through the pulmonary vein.
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Other cards in this set
Card 2
Front
plasma transports various chemical substances around the body such as the products of digestion, hormones, antibodies, urea and carbon dioxide.
Back
Plasma
Card 3
Front
contains haemoglobin, which binds to oxygenate transport it from the lungs to the tissues and cells, which need it for respiration.
Back
Card 4
Front
Do not contain a nucleus so more room for haemoglobin. Very small so they can fit through tiny capillaries. shaped like biconcave disks so large surface area-oxygen can quickly diffuse across.
Back
Card 5
Front
help protect the body against infection. Can change shape so they can squeeze out of the blood vessels surround and engulf microorganisms.
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