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Related Concept Videos

Filtration and Urine Formation01:32

Filtration and Urine Formation

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The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.
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Confirmation Biases01:31

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The confirmation bias is the tendency to focus on information that confirms our existing beliefs and ignore information that is inconsistent with our expectations. For example, if you think that your professor is not very nice, you notice all of the instances of rude behavior exhibited by the professor while ignoring the countless pleasant interactions he is involved in on a daily basis. Have you ever fallen prey to the confirmation bias, either as the source or target of such bias?
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Urine Studies II: Urine Culture and Sensitivity Test01:26

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A urine culture and sensitivity test is a diagnostic procedure used to identify urinary tract bacterial infections and determine the most effective antibiotics for treatment. This test is generally preferred when a patient shows manifestations of a urinary tract infection, such as frequent or painful urination, cloudy or foul-smelling urine, or lower abdominal pain.Purpose of the TestThe primary goals of a urine culture and sensitivity test are to:Determine the specific bacteria causing the...
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Urine Studies I: Urinalysis01:29

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Urinalysis is a widely used diagnostic test that analyzes urine's physical, chemical, and microscopic characteristics. Healthcare providers use it to detect and monitor various health conditions, including renal disease, urinary tract infections (UTIs), diabetes, and metabolic or systemic disorders.Components of UrinalysisUrinalysis consists of three primary components: physical, chemical, and microscopic examination. Each provides unique insights into the urine sample and, by extension, the...
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Physiology of Urine Formation01:24

Physiology of Urine Formation

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Urine formation is an essential function of the human body. It plays a critical role in maintaining homeostasis by regulating the volume and composition of body fluids. The kidneys, the primary organs involved in this process, filter blood to remove waste products and excess substances, ultimately producing urine.
Glomerular Filtration
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Formation of Concentrated Urine01:23

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There is a gradient of solutes in the interstitial fluid from the renal cortex through the medulla, known as the medullary osmotic gradient. The juxtamedullary nephrons establish and maintain this gradient using countercurrent mechanisms with loops extending deep into the medulla. These nephrons also use countercurrent mechanisms to regulate urine volume and concentration. The interaction between the descending and ascending limbs of the nephron loop creates an osmotic gradient through...
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Related Experiment Video

Updated: Feb 10, 2026

Loop-Mediated Isothermal Amplification for Screening Salmonella in Animal Food and Confirming Salmonella from Culture Isolation
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Saxitoxin Exposure Confirmed by Human Urine and Food Analysis.

R M Coleman1, G Ojeda-Torres2, W Bragg1

  • 1Division of Laboratory Science, Centers for Disease Control and Prevention, 4770 Buford Highway, MS F44, Atlanta, GA, USA.

Journal of Analytical Toxicology
|May 26, 2018
PubMed
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An elderly woman experienced severe paralytic shellfish poisoning (PSP) after eating contaminated shellfish. Analysis confirmed high levels of various paralytic shellfish toxins (PSTs), including previously undetected gonyautoxins in her urine, emphasizing the need for comprehensive testing.

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Area of Science:

  • Marine Biology
  • Toxicology
  • Public Health

Background:

  • Paralytic Shellfish Poisoning (PSP) is a serious public health concern caused by consuming marine biotoxins.
  • Recreational harvesting of shellfish poses a risk for PSP exposure, particularly in regions with known toxin-producing algae.

Observation:

  • An elderly female presented with severe symptoms of PSP, including respiratory depression and shock, after consuming recreationally harvested shellfish.
  • Laboratory analysis of a remaining clam confirmed the presence of multiple paralytic shellfish toxins (PSTs), including saxitoxin (STX), neosaxitoxin (NEO), and various gonyautoxins (GTX).
  • Patient's urine analysis revealed STX, NEO, and GTX1-4, with GTX congeners being identified for the first time in a PSP case from Alaska.

Findings:

  • The case highlights the potential for severe PSP even with sporadic consumption and in individuals without a history of illness.
  • The identification of GTX in the patient's urine underscores the importance of detecting a broad range of PST congeners for accurate diagnosis and risk assessment.
  • The detected toxin levels in both the shellfish and the patient's urine were significant, correlating with the severity of the clinical presentation.

Implications:

  • This case emphasizes the critical need for robust monitoring programs and accurate diagnostic methods for PSTs to prevent severe public health outcomes.
  • Expanded testing protocols that include all STX congeners are essential for protecting public health and improving the understanding of PST toxicity.
  • Public awareness and education regarding the risks associated with consuming wild-harvested shellfish are crucial for preventing future PSP incidents.