Urinary System

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Primary role of Urinary system for homeostasis is to.....
- _{Regulate Extracellular Fluid Volume and Osmolarity}
- Maintain Ion and Ph Balance
Function of the urinary system is to remove, wastes, foreign substances and excess nutrients such as.....

1. Urea, Urobilinogen, Urates, Uric Acid, and Creatinine & Creatine
Function of the urinary system for hormones and enzymes include....
- Erythropoietin
- Prostoglandins
- Renin
- Help convert Vit D into a hormone or active form.
- Kallikrein
- Thromboxane
What is micturation?
Stimulated by?
- Storage of urine and urination
- Stimulated by parasympathetic nerves to the detrusor muscle
THe kidneys use four major processes to control the composition of blood, what are they?
- GLomerular Filtration
- Tubular Reabsorbtion
- Tubular Secretion
- Excretion
What are the three layers of the Ureters?
Innermost to outermost
- Tunica Mucosa
- Tunica Muscularis
- Fibrous
Ureters carry out _________ and stimulated by ........
- Peristalsis
- Stimulated by the sympathetic nervous system
What are the 3 layers of the Urinary Bladder?
- Tunica Mucosa (EPithelial layer)
- Submucosal Layer (Loose Connective tissue)
- Muscular Layer (which includes detrusor layers)
PCT has...............
____% of reabsorbtion occurs here
- Cuboidal epithelium & Microvilli
- 80%
Distal Convoluted Tubule (DCT) has.......
___% of reabsorbtion occurs here
- Cuboidal Epithelium & Microvilli
- 18%
Loop oh henle has.....
- Squamosal epithelium
- Thick a& thin Descending limb
- Thin Ascending Limb
What type of epithelium are the collecting duct and papillary duct comprised of?
Has ____ & _____ Cells.
Dumps into ____ _____
- Mostly Columnar Epithelium
- Has Principle & Intercalated Cells
- Dumps into the minor Calyces
What do JG cells secrete when stimulated by the _____ _____ located in the _______.

Secrete renin when stimulated by the macula densa located in the DCT.
What are the 2 types of nephrons?
- Cortical - Which dont penetrate the medulla
- Juxtamedullary - Do penetrate the medulla
Bowmans capsule & GLomerulus
Outer Layer =
Inner Layer = _______ contains....
What can contract to close filtration slits?
- OL = Parietal - Simple Squamous Epithelium
- IL = Visceral - Contains:
- ^{_{Podocytes w/ filt slits/pores w memb stretched across the pores.}}
What can close/open filtration slits? Pedicels
Approx how long are the ureters?

10 - 12 inches
What two processes aid or influence the filtering process?
- Filtering COefficient (how wholy filt memb is)
- A difference in pressures cause filtration.
What 3 things wont filter????
- Formed elements (ex)
- Large Proteins
- Conjugates of proteins (things that attach to it)
Pressure formula =

P = pGC - pBC - pieGC
What is the net pressure pushing out of the glomerulus?

_{What it filtration coefficient in males?}
_{What it filtration coefficient in females?}

_{What is glomerular filt rate in males per min?}
_{What is glomerular filt rate in females per min?}
_{10 - 16mm Hg}
- _{filtration coeficient (K^f) in males? 12.5mmHg}
- _{filtration coeficient (Kf) in females? 10 mmHg}
- _{Male Glomerular Filtration Rate = 125mL/min}
- _{Female Glomer. Filtration Rate=115mL/min}
GFR = Net Filtration x K_f
How many % of filtrate do we excrete everyday?

1-2L Day, rest gets reabsorbed
How much urine is produced per min for an average healthy person?
hr?
day?
- 1.25 mL/min
- 75 mL/hr
- 1.8L/day
Drops as we age
Factors that affect filtration rate:

Increase resistance of the afferent arteriole
Increase resistance of the afferent arteriole
Increase resistance of the afferent arteriole
Increase resistance of the afferent arteriole

Card Set Information

Author:	skhan11
ID:	213462
Filename:	Urinary System
Updated:	2013-04-15 06:06:24
Tags:	Urinary System
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Description:	Urinary System
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