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984621
Renal System (Part of)
Descrição
Mapa Mental sobre Renal System (Part of) , criado por Addeana em 08-06-2014.
Sem etiquetas
nursing
first year
science
renal
system
urine
formation
kidneys
Mapa Mental por
Addeana
, atualizado more than 1 year ago
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Criado por
Addeana
aproximadamente 10 anos atrás
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Resumo de Recurso
Renal System (Part of)
Anatomy
Kidney
Function
Regulating
blood electrolyte composition by excreting excessive ions into urine
blood pH be excreting/conserving H+ or bicarbonate ions
Blood volume by conserving/eliminating water
blood pressure via blood volume and by RAAS and ANP
Mantaining
blood osmolarity by excreting excessive ions into urine
Excreting
Waste products e.g urea, ammonia
Producing
Hormones e.g. EPO , calcitriol = producing enzyme renin = production of angiotensin and aldosterone
Physiology
Components
Nephron
Renal Corpscle
Glomerulus
glomerular capsule
Renal tubule
Hormones and its effect
Aldosterone
Promotes tubular reabsorption of Na+ = increased water reabsorption
Decreased urine output
Antidiuretic hormone
Increases water permeability in nephron = increased water reabsorption
decreased urine output
Atrial natriuretic peptide
Inhibits tubular reabsorption of Na+ = decreased water reabsorption
Increased urine output
Urine formation
Glomerular formation ; filtration/movement of water and small solutes from Glomerulus to the Glomerular Capsule due to blood pressure
Tubular reabsorption ; process of selectively returning back useful substances from the filtrate back to the blood
e..g. Glucose , amino acids , water , Na+ , Cl- , Ca2+ , H+ , HCO3-
Tubular secretion = selective removal of additional wastes from blood to the filtrate
e.g. H+ and K +
Full cycle from blood to excretion
Ageing
Kidney shrink
nephrons decrease in size and number
Glomerular filtration rate decreases
inability to compensate for fluid overload
Tubule cells become less effeicient
inability to compensate for dehydration
Bladder capacity decreases
Urinary retention
commonly in elderly men due to prostate enlargement
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