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BLOOD, Plasma, 4000μm - Coggle Diagram
BLOOD
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White Blood Cells
Lymphocytes
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Some of them secrete chemicals called antibodies, which attach to and destroy the invading cells
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white blood cells all have a nucleus, although the shape of this varies in different types of white cell
most are larger than red blood cells, although one type, lymphocytes, may be slightly smaller
white blood cells are either spherical or irregular in shape, never looking like a biconcave disc
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Red Blood Cell
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Haemoglobin
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- 4 polypeptide chains (Quaternary structure)
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- Transports oxygen from lungs to respiring tissues
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Blood Vessels
Arteries
to transport blood, swiftly and at high pressure, to the tissues.
arterioles
as arteries reach the tissue to which they are transporting blood, they branch into smaller and smaller vessels, called arterioles.
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capillaries
to take blood as close as possible to all cells, allowing rapid transfer of substances between cells and blood.
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structures
very slow
■ an inner endothelium (lining tissue), called the tunica intima, made up of a layer of flat cells (squamous epithelium) fitting together like jigsaw pieces; this layer is very smooth, minimising friction with the moving blood
■ a middle layer called the tunica media (‘middle coat’), containing smooth muscle, collagen and elastic fibres
■ an outer layer called the tunica externa (‘outer coat’), containing elastic fibres and collagen fibres.
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veins
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venules
as blood leaves a capillary bed, the capillaries gradually join with one another, forming larger vessels called venules
5000μm
structures
■ an inner endothelium (lining tissue), called the tunica intima, made up of a layer of flat cells (squamous epithelium) fitting together like jigsaw pieces; this layer is very smooth, minimising friction with the moving blood
■ a middle layer called the tunica media (‘middle coat’), containing smooth muscle, collagen and elastic fibres
■ an outer layer called the tunica externa (‘outer coat’), containing elastic fibres and collagen fibres.
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protiens,nutrients, hormones,
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Color is yellow
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ilirubin , carotenoids, haemoglobin and iron transferrin.
Platelets / thombocytes
Small, colourless blood cells
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Secretes vasoconstrictors, which constricts blood vessels
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