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Biology - Blood and Blood vessels - Coggle Diagram
Biology - Blood and Blood vessels
Blood vessels
Arteries
carry blood away from the heart
high pressure
Structure
Thick walls
Lumen
size of hole
Thick layers of muscle
strong
Elastic Fibres
stretch
spring back
Capillaries
involved in exchange of materials at tissues
tiny
carry blood very close to every cell
supply food and oxygen
take away CO2
Structure
Permeable walls
substance can diffuse in and out
One cell thick walls
shorter diffusion path
Veins
carry blood to the heart
low pressure
Structure
bigger lumen
Valve
blood flow in right direction
Blood
Red Blood Cells
carry oxygen from lungs to cells
Structure
biconcave
large S.A
absorb oxygen
No nucleus
more room for oxygen
Haemoglobin
red pigment
in lungs
bind to oxygen
oxyhaemoglobin
body tissues
splits back up to release oxygen
White Blood Cells
defend against infections
Structure
some change shape
eat microorganisms
produce antibodies
fight microorganisms
antitoxins
neutralise toxins
Platelets
help blood clot at wound
stop blood pouring out
stop microorganisms
Structure
small fragments of cells
no nucleus
Plasma
pale straw-coloured liquid
carries everything in blood
RBC, WBC, platelets
glucose and amino acids
CO2
urea
Hormones
Proteins
Antibodies
Antitoxins