Urine Composition and Components
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Questions and Answers

What is urine composed of?

95% water and 5% solutes

What is the organic composition of urine?

urea, creatinine, uric acid, hippuric acid, other substances

What is the inorganic composition of urine?

sodium chloride, potassium, sulfate, phosphate, ammonium, magnesium, calcium

What is urea?

<p>metabolic waste product produced in the liver from the breakdown of protein and amino acids</p> Signup and view all the answers

What is creatinine?

<p>nitrogenous substance in muscle tissue</p> Signup and view all the answers

What is uric acid?

<p>common component of kidney stones; derived from catabolism of nucleic acid in food and cell destruction</p> Signup and view all the answers

What is hippuric acid?

<p>benzoic acid is eliminated from the body in this form; increases with high-veggie diets</p> Signup and view all the answers

What are other substances present in urine?

<p>carbs, pigments, fatty acids, mucin, enzymes, hormones</p> Signup and view all the answers

What is sodium chloride in relation to urine?

<p>principal salt; varies with intake</p> Signup and view all the answers

What role does potassium play in urine composition?

<p>occurs as chloride, sulfate, phosphate salts</p> Signup and view all the answers

What is the source of sulfate in urine?

<p>derived from amino acids</p> Signup and view all the answers

What is the primary form in which phosphate occurs in urine?

<p>occurs primarily as sodium compounds that serve as buffers in blood</p> Signup and view all the answers

What is ammonium derived from?

<p>derived from protein metabolism and glutamine in kidneys</p> Signup and view all the answers

How does magnesium occur in urine?

<p>occurs as chloride, sulfate, phosphate salts</p> Signup and view all the answers

How does calcium occur in urine?

<p>occurs as chloride, sulfate, phosphate salts</p> Signup and view all the answers

What is the normal daily volume of urine?

<p>1200-1500 mL</p> Signup and view all the answers

What is the normal day/night ratio of urine production?

<p>2:1 or 3:1</p> Signup and view all the answers

What is diuresis?

<p>increased production</p> Signup and view all the answers

What is polyuria?

<blockquote> <p>2000 mL/day</p> </blockquote> Signup and view all the answers

What is oliguria?

<p>decreased urine output; typically defined as less than 400 mL/day</p> Signup and view all the answers

Study Notes

Urine Composition

  • Urine consists of 95% water and 5% solutes.

Organic Composition

  • Key organic components include urea, creatinine, uric acid, hippuric acid, and various other substances.

Inorganic Composition

  • Major inorganic components are sodium chloride, potassium, sulfate, phosphate, ammonium, magnesium, and calcium.

Urea

  • A significant metabolic waste produced in the liver from protein and amino acid breakdown; accounts for 60-90% of nitrogenous waste in urine.

Creatinine

  • A nitrogenous byproduct found in muscle tissue, indicative of muscle metabolism.

Uric Acid

  • A precursor to kidney stones; results from nucleic acid breakdown in food and during cellular decomposition.

Hippuric Acid

  • A compound formed from benzoic acid, excreted in higher amounts with vegetarian diets.

Other Substances

  • Urine may also contain small quantities of carbohydrates, pigments, fatty acids, mucin, enzymes, and hormones.

Sodium Chloride

  • The primary salt in urine, levels fluctuate according to dietary intake.

Potassium

  • Present in urine mainly as chloride, sulfate, and phosphate salts.

Sulfate

  • Derived from the metabolism of amino acids.

Phosphate

  • Mainly exists as sodium compounds that help balance pH in the blood.

Ammonium

  • Comes from protein metabolism and glutamine in kidneys; its concentration varies with blood and fluid acidity.

Magnesium and Calcium

  • Both minerals are found as chloride, sulfate, and phosphate salts in urine.

Normal Daily Volume

  • Typical urine output ranges from 1200 to 1500 mL per day.

Normal Day/Night Ratio

  • Urine production is often at a 2:1 or 3:1 ratio during the daytime compared to nighttime.

Diuresis

  • Refers to the increased production of urine.

Polyuria

  • Defined as urine output exceeding 2000 mL per day.

Oliguria

  • Characterized by reduced urine output, which indicates potential health issues.

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Description

This quiz explores the composition of urine, highlighting its organic and inorganic substances. Learn about key components such as urea, creatinine, and uric acid and their roles in metabolic processes. Understand how urine composition can reflect dietary habits and overall health.

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