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1

organs of the urinary system

1. kidneys
2. ureter
3. bladder
4. urethra

2

kidneys

filter blood

3

ureter

transports urine to urinary bladder

4

bladder

storage tank for urine

5

urethra
-definition
-length in female
-length in male

-conducts urine to outside
- 1-2 in long
- 7-8 in long

6

3 functions of the urinary system

1. excretion
2. elimination
3. homeostatic regulation

7

excretion

removal of organic waste products from body fluids

8

elimination

discharge of waste products into the environment

9

homeostatic regulation
-5

1. regulates blood vol and pressure
2. regulates concentration of plasma ions
3. helps stabilizes blood pH
4. helps conserve valuable nutrients
5. assists liver in detoxification

10

kidney
-location
-embedded in
-___ long, ___ wide, ___ thick

-posterior abdominal wall; behind the peritoneum (retroperitoneum)
-fat
- 4 in long, 3 in wide, 1 in thick

11

9 structures of the kidney

1. renal medulla
2. renal cortex
3. renal capsule
4. renal pyramid
5. renal papilla
6. renal columns
7. calyces
8. renal lobe
9. renal pelvis

12

renal capsule

CT covering

13

renal pyramid

triangular structures that make up the renal medulla

14

renal papilla

end of the pyramid

15

renal columns

extensions of the cortex between pyramids

16

calyces

cup shaped drain near papilla

17

renal lobe
-definition
-function

renal pyramid that is part of the renal column and renal cortex; functional unit
-produce urine

18

renal pelvis

connected to the ureter

19

what is the functional unit of the kidney

the nephron

20

nephron
-aka
-site of
-how many does each kidney had

-renal tubule
-urine production
- 1.25 x 10 ^6

21

8 nephron structures

1. renal corpsule
2. bowman's capsule
3. proximal convoluted tubule (PCT)
4. distal convoluted tubule (DCT)
5. collecting duct
6. loop of henle
7. descending limb of the loop of henle
8. ascending limb of the loop of henle

22

proximal convoluted tubule

reabsorption of H2O, ions and all organic nutrients

23

distal convoluted tubule
-2 functions

-secretion of acids, ions, drugs and toxins
-some reabsorption of H2O, Na+, and Cl- ions

24

collecting duct
-2 functions

1. some reabsorption of H2O
2. some secretion of Na+, K+, H+, and HCO3- ions

25

peritubular space
-definition
-contains

-area surrounding the nephron
-contains peritubular fluid

26

loop of henle

reabsorption of H2O, Na+ and Cl- ions

27

descending limb of the loop of henle

reabsorption of H2O

28

ascending limb of the loop of henle

reabsorption of Na+ and Cl-

29

renal corpuscle
-function
-what is it

produces filtrate
-Bowman's casule and glomerulus

30

2 types of nephrons in the kidneys

1. cortical nephron
2. juxtamedullary nephron