BIOLOGY 238

Study Guide

Urinary System

| Nephron Function Chart |

1. Identify the locations and functional relationships of the following urinary system organs: urinary bladder, urethra, ureters, kidneys.

2. Describe the functional anatomy of the following kidney structures: renal capsule, renal fascia, cortex, medulla, pyramids, renal columns, renal pelvis, calyces, renal arteries and vein, lobar and interlobar arteries and veins arcuate arteries and veins, interlobular arteries and veins.

3. Describe what constitutes a nephron and identify the relationships of the following components of nephrons and their location within the kidney: afferent and efferent arterioles, glomerulus, Bowman's (glomerular) capsule, proximal convoluted tubule (PCT), loop of Henle (ascending and descending limb), distal convoluted tubule, collecting tubule (DCT), renal papillae, peritubular capillaries, vasa recta.

4. Compare cortical nephrons with juxta-medullary nephrons with regard to the above structures and their locations.

5. Describe the structures and functions of the components of the renal corpuscle: parietal and visceral layers of Bowman's capsule, fenestrations, podocytes, pedicels, filtration slits.

6. Describe the process of filtration, including location, causation, relationship to anatomical structures, what and how much is filtered. Terms: net filtration pressure (NFP), glomerular filtration rate (GFR), filtration membrane.

7. Describe the process of reabsorption including locations, causation, relationship to anatomical structure, what and how much is reabsorbed, and where. Terms: obligatory reabsorption, facultative reabsorption, transport maximum (TM).

8. Describe the process of secretion, including locations, relationship to anatomical structures, what is secreted, and by what mechanism.

9. Identify and describe the countercurrent mechanisms to concentrate the urine. Terms: countercurrent multiplier, countercurrent exchange.

10. Identify and distinguish the histological differences between the cells of Bowman's capsule, the proximal convoluted tubule, the thin and thick segments of the loop of Henle, the distal convoluted tubule, and the collecting tube. Relate these differences to the function of each structure.

11. Describe how autoregulation in the kidney responds to changes in blood pressure to maintain relatively constant GFR. Terms: myogenic mechanism, tubuloglomerular feedback mechanism, macula densa, juxtaglomerular cells.

12. Describe the ADH (anti-diuretic hormone) mechanism for regulating the body's fluid balance, including components (organs), stimuli, and physiological effects. Include: role of hypothalamus, posterior pituitary, and collecting tubule. Terms: osmolarity, diabetes insipidus.

13. Describe the mechanisms for control of blood pressure and electrolyte balance involving the juxta-glomerular apparatus and adrenal cortex. Include: role of macula densa, aldosterone, renin, angiotensin II. Terms: juxtaglomerular (JG) cells, macula densa, angiotensin converting enzyme (ACE).

14. Identify the normal constituents of urine as well as the possible disorders indicated by the following: glucose, albumin, bacteria, leucocytes, erythrocytes, bilirubin, ketone bodies, crystals, casts. Terms: diabetes mellitus, urinary tract infection (UTI), cystitis, pyelonephritis, glomerulonephritis.

15. Describe the functional anatomy of the ureters, bladder, and urethra: Include: transitional epithelium , smooth muscle layers, detrusor muscle, adventitia, rugae, trigone, internaland external urethral sphincters, urogenital diaphragm, prostatic urethra, membranous urethra, spongy urethra.

Additional Terms:

hemodialysis

hematuria

renal failure

urobilinogen

creatinine

glucosuria