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4271356
1_Blood & Circulation
Description
GCSE Biology Mind Map on 1_Blood & Circulation, created by jaeg lawson on 05/01/2016.
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blood & circulation
triple biology
biology
gcse
Mind Map by
jaeg lawson
, updated more than 1 year ago
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Created by
Scott Church
almost 9 years ago
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jaeg lawson
almost 9 years ago
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Resource summary
1_Blood & Circulation
Red Blood Cells
Contain no nucleus ( have a dip in the centre)>more oxygen carried
Large surface area compared to volume > oxygen close to surface
Platelets
Platelets clot the blood after a wound > prevents infection and blood loss
People with haemophilia have a faulty gene for the clotting process
White Blood Cells
Larger than red blood cells, flexible shape to help engulf disease organism
Protects against infection by digesting harmful microbes, bacteria digested inside WBC
Able to squeeze out of capillaries to defend different tissues
Plasma
Contains mostly water, dissolved food, urea, hormones and carbon dioxide
Pale yellow fluid carries blood cells, useful substances and waste around the body through blood vessels
Pulmonary Artery > Carries blood from the heart to the lungs
Aorta (Artery) > Carries blood from heart to body
Pulmonary Vein > Carries blood from lung to heart
Vena Cava (Vein) > Carries blood from body to heart
heart
how is works
blood flows into the atrias from the vena cava and pulmonary vein
atria contracts pushing blood into the ventricles
ventricles contract forcing blood to the lungs through the pulmonary artery and to the body through the aorta
blood flows to the heart from the bady through the vena cava and from the lungs through the pulmonary vein
this refills the atrias and restarts the process
blood vessels
Arteries = Away
Arteries have thick walls because the blood pressure is very high. They also have thick elastic walls
Capillaries = Small cells
walls are one cell thick to allow substances to be transferred
veins=away
veins have valves to prevent backflow
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