1 / 16

Chapter 19, part B

Chapter 19, part B. The Kidneys. Reabsorption: 1 0 Active Transport. (Passive diffusion in) Active Transport Na + to ECF K + into cell ATP-ase Uses energy Na + ECF  peritubular capillaries Reabsorption  blood. Reabsorption: 1 0 Active Transport.

ronna
Télécharger la présentation

Chapter 19, part B

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 19, part B The Kidneys

  2. Reabsorption: 10 Active Transport • (Passive diffusion in) • Active Transport • Na+ to ECF • K+ into cell • ATP-ase • Uses energy • Na+ ECF peritubular capillaries • Reabsorption  blood

  3. Reabsorption: 10 Active Transport Figure 19-11: Sodium reabsorption in the proximal tubule

  4. Reabsorption: Secondary Active Transport • Na+ linked 20 transport • Symport • Glucose • Ions • Amino acids • Proximal tubule, key site Figure 19-12: Sodium-linked glucose reabsorption in the proximal tubule

  5. Reabsorption: Passive Transport & Trancytosis • Passive Transport of urea • Na+ pumped out • H2O follows • Passive •  [urea] • [urea] higher than ECF • passive diffusion to ECF • Trancytosis of proteins

  6. Reabsorption: Passive Transport & Trancytosis Figure 19-13: Passive reabsorption of urea in the proximal tubule

  7. Reabsorption: Receptors can Limit • Transport maximum • Saturation (# of receptors) • Competition • Specificity • Renal Threshold • Example: glucosuria

  8. Reabsorption: Receptors can Limit Figure 19-15: Glucose handling by the nephron

  9. Secretion: From Peritubular Blood vessels & ECF • Active Transport into nephron tubules • Example: K+ & H+ (more on this next unit)

  10. Secretion: From Peritubular Blood vessels & ECF Figure 19-2 : Filtration, reabsorption, secretion, and excretion

  11. Solute Clearance: Rate of removal from the Blood • Information on Kidney Function • GFR • Reabsorption rates • Secretion rates Figure 19-16: Inulin clearance

  12. Excretion: All Filtration Products that are not reabsorbed • Excess ions, H2O, molecules, toxins, "foreign molecules" • "nitrogenous waste": NH4+ and excess urea • Kidney Ureter  bladder urethraout of body

  13. Excretion: All Filtration Products that are not reabsorbed Figure 19-5: The filtration fraction

  14. Urination: Micturation reflex • Bladder: • smooth muscles • internal sphincter • external sphincter • Regulation

  15. Urination: Micturation reflex Figure 19-18: The micturition reflex

  16. Summary • Kidney produces urine, ureter bladder urethra • Nephron filters, reabsorbs, secretes and excretes • Arteriole pressure dictates GFR through autoregulation, ANS and hormonal influences • Most filtrate is reabsorbed & returned via peritubular blood vessels; excess & toxic remains are excreted • Urination reflex uses involuntary and voluntary paths

More Related