Excretion in Humans PDF

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n1 N \ I ff(' hi< ld flm\, th rou h tr thJn throu~h tht' hi 1ri othtr OfRHl m th< ho h I It \\ Jc;,((' and toxk ~uh t..m tt, po~i;.iblc from tht blond. Jnd ~ft urine. In the p,1st dollor-. u l < h I t' colour of urinl'. srncll 1t.1t1d c I ll It, tr> help diagnose\\ hat \\c1, \Holl 11 l J)Jll nt Toda\ doctors c1nd nurses u~c J1 ' lo tit Uno tests.,~s a quick" ti) Lo ident 1fv I pdllC:nt t~ flfig 13 1 A d1psttck tr>~l Ike this can quickly healthv., or not. test unne fo, a number of excreted substances. KNOWLEDGE CHECK ✓ Humans breathe out carbon dioxide produced from respiration. ✓ Excess amino acids from digestion are broken down to form urea in the liver. LEARNING OBJECT 1vFc ✓ State that carbon dioxide is excreted through the lungs. ✓ State that the kidneys excrete urea and excess water and ions. ✓ Identify in diagrams and images the kidneys, ureters, bladder and urethra. ✓ SUPPLEMENT Identify in diagrams and images the structure of the kidney, limited to the cortex and medulla. ✓ SUPPLEMENT Outline the structure and function of a nephron and its associated blood vessels, limited to: the role of the glomerulus in the filtration from the blood of water, glucose, urea and ions; the role of the nephron in the reabsorption of all of the glucose, some of the ions and most of the water back into the blood; the formation of urine containing urea, excess water and excess ions (details of these processes are not required). ✓ converting SUPPLEMENT Describe the role of the liver in the assimilation of amino acids by them to proteins. ✓ SUPPLEMENT State that urea is formed in the liver from excess amino acids. ✓ part SUPPLEMENT Describe deamination as the removal of the nitrogen-containing of amino acids to form urea. ✓ SUPPLEMENT Explain the importance of excretion, limited to toxicity of urea. EXCRETION IN HUMANS l·,artion i, defined ds the proc-e-..._ or 11ttJt.c\slls mto I he plnsma or I hr blood. and I\ ct1rrwd dWund the hnt.h untHit rL'achrs the lungs. I !ere it diffuse5 thrnugh the cc1p1ll.in, and ,1 h l'oh \\ ,tlls and is brc.ll ht.:d out. \ ~ aslc products of CL'II processes, for exomplc urea from the hvcr, d1ssoh c m the blood and arc carried to the kidneys. \\ here they me.. l' '\Cl'C t l'd. food dnd drin1'. c;:rn.id