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Excretion - Coggle Diagram
Excretion
Ultrafiltration
D: filtration under pressure
- plasma + small substances filtered
out of blood into BC
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- Blood enters glomerulus
@ high hydrostatic pressure
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- HP forces SMALLER
substances out
of blood into BC
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- LARGER components retained in
blood as too large to pass through
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- Aided by STURCTURE of
capillary walls + lining of BC
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basement membrane
- EFFECTIVE FILTER
- molecular sieve
- extracellular matrix (gel) formed
many different proteins
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capillary endothelium
- make walls of glomerular capillaries
- squamous endothelial cells
podocytes
- lines Bowman's Capsule
- have extensions in 2 planes that
allow material pass through easily
- filtration opposed by
smaller osmotic force
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Reabsorption
D: when useful blood components move from the filtrate
- into cuboidal epithelium of nephron (mostly in PCT)
- then into blood capillaries of vasa recta system
- useful blood components lost to glomerular filtrate selectively reabsorbed into PCT
- glucose, amino acids + salts move by
- ACTIVE TRANSPORT
- FACILITATED DIFFUSION
- water moves by
- OSMOSIS
- when aa,gluc+salts move into blood (selectively reabsorbed)
- create more neg SP in blood
- water moves passively by osmosis
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3.urea not reabsorbed but
some moved by into blood by
- DIFFUSION
- through conc gradient
- as water reabsorbed, concentration of urea increases down PCT
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6.small proteins reabsorbed by
- additional water reabsorbed from
collecting ducts
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