Gero 310 F'09 urinary

Gero 310 F'09 urinary - Urinary system Normal function...

Info icon This preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Normal function, physiology and anatomy • functions Urinary system 1. Waste removal - byproducts of cellular metabolism passed to blood, removed by urinary system - wastes include urea, ammonia (protein/amino acid breakdown), uric acid (nucleic acid breakdown), creatinine (from muscle cells) 2. Osmotic and blood pressures - regulate water levels in blood which affects blood pressure and fluid content in tissues 3. Ion concentrations - alter retention/absorption of different materials as needed - regulated ions including Ca ++ , Na + , K + , Mg ++ Chp 12 Chp 12
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
• anatomy and physiology * process of action = filtering - primary filtering organ is kidney - kidney acts as a specialized filtering system - kidney filters like a collander: retains good material and lets out bad stuff (e.g., dirt) and excess (e.g., water) - blood is the filtered material QuickTimeª and a TIFF (Uncompressed) decompressor are needed to see this picture. encognitive.com
Image of page 2
* kidney anatomy - outer region called cortex - inner region called medulla - kidneys organized into functional units called nephrons - ~1 million nephrons per kidney
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
- blood flows into kidney via the renal artery - renal artery flows directly from aorta - blood flows through kidney, is filtered, then exits via the renal vein
Image of page 4
- nephrons consist of several anatomical components: * glomerulus * Bowman’s capsule * renal tubule : three sections: 1. proximal tubule 2. loop of Henle 3. distal tubule
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
• nephron performs four basic functions : 1. filtration of blood 2. reabsorption of desirable components * esp. glucose, water, amino acids, ions 3. active secretion of unwanted components * including excess ions, drug clearing 4. collection & excretion of urine * urine : waste products & water
Image of page 6
How is filtration accomplished ? • arterioles branched from the renal artery terminate in capillaries called glomeruli
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
• much of blood contents passes through glomeruli into kidneys at site called Bowman's capsule - many blood components retained by glomeruli • from Bowman's capsule, blood filtrate passes into the proximal renal tubule
Image of page 8
• desirable components of blood filtrate reabsorbed and returned to blood - water, ions, etc, • distal tubule particularly important in water reabsorption - site of action of anti- diuretic hormone (ADH) - recall that ADH released by pituitary under hypo- thalamic control to increase water content of blood
Image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
• undesirable and waste
Image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern