Term
| Excretory System Function: |
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Definition
| Excrete Metabolic waste and maintain homeostasis |
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Term
| Includes Activities performed by: |
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Definition
*Integumentary System (sweat)
*Respiratory System (Exhale)
*Digestive System (Liver)
*Urinary System |
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Term
| Urinary System Maintains Homeostasis by: (6) |
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Definition
*Regulating Blood Volume
*Regulating electrolyte Concentrations
*Conserving Valuable nutrients
*Stabilizing pH
*Excreting Metabolic waste (nitrogenous waste)
*Assisting liver in detoxification |
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Term
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Definition
*Urea
*Uric acid
*Creatinine |
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
*Kidneys
*Ureters
*Bladder
*Urethra |
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Term
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Definition
*Two Kidneys
*Cortex
*Medulla
*Caylx |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Collects filtrate from medulla -> ureters |
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Term
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Definition
| *Collect filtrate (urine) from Caylx and deliver to bladder. |
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Term
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Definition
| *Muscular organ for temporary urine storage |
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Term
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Definition
| *Passage from bladder to external environment |
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Term
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Definition
| Functional Unit in the Kidney |
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Term
| How many nephrons in a kidney? |
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Definition
| approx. 1.25 million/kidney |
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Term
| How much blood does each nephron filter a day? |
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Definition
| Each filters ~ 180L (50 gallons)of blood per day |
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Term
| How much of that is Plasma volume? |
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Definition
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Term
| How much of filtrate is reabsorbed? |
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Definition
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Term
How does the Nephron Work?
1 |
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Definition
| *In nephron blood capillaries (glomerulus) surrounded by Boman's capsule |
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Term
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Definition
| *Blood pressure forces liquid portion of plasma through capillaries in glomerulus into Bowman's capsule |
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Term
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Definition
| *Renal tubules reabsorb water via osmosis, electrolytes, H+, nutrients selectively reabsorbed along tubules |
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Term
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Definition
| *Undesirable molecules selectively secreted into filtrate |
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Term
Nephron Control
How does the Nephron know what to get rid of and what to keep? |
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Definition
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Term
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Definition
*Blood pressure controls the amount of filtrate
*Special proteins increase/decrease arteriole pressure
*ADH regulates water absorption
*Aldosterone influences electrolyte re absorption
*Renel threshold for nutrients
*Diffusion effects re absorption of most electrolytes |
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Term
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Definition
*Filtrate(urine) from nephron into collecting tubules -> Calyx
*Caylx dumps urine into ureters
*Urine temporary stored in bladder
*Urine leaves body via urethra through external urethral sphincter |
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Term
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Definition
*Male urethra shared with reproductive system in penis
*Female urethra separate from reproductive system |
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