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Related Concept Videos

Toxic Reactions: Overview01:26

Toxic Reactions: Overview

When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Hemorrhagic Stroke ll: Pathophysiology01:29

Hemorrhagic Stroke ll: Pathophysiology

A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...
Toxidromes: Clinical Features01:30

Toxidromes: Clinical Features

Toxidromes are specific patterns of symptoms resulting from toxic substance exposure. They help in the identification and treatment of poisoning. The symptoms of each toxidrome group indicate poisoning by a certain class of chemicals or drugs.1. Sympathomimetic: Stimulates the sympathetic nervous system. Symptoms include agitation, increased heart rate (HR), blood pressure (BP), respiratory rate (RR), temperature, and pupil size. Drugs like cocaine and amphetamines, along with tremors and...
Drug Toxicity: Overview01:00

Drug Toxicity: Overview

Drug toxicity quantifies the harm a compound causes to an organism, varying by dose and potentially impacting whole systems or specific organs like the liver. Toxic reactions may arise from venomous insect or spider bites, with effects ranging from mild symptoms to severe outcomes such as brain damage or death. Common forms of acute poisoning include ethanol intoxication and overdose of pain or fever medications, with substances like GHB and heroin being particularly lethal at doses close to...
Anticholinesterase Agents: Poisoning and Treatment01:26

Anticholinesterase Agents: Poisoning and Treatment

Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.     
Irreversible agents form a strong bond with the cholinesterase enzyme, making it inactive. The breakdown of the phosphorylated enzyme is slower than the...
Antidotes01:17

Antidotes

Antidotes are medicinal substances used to counteract the harmful effects of toxins or drugs in the body. They function in various ways, each uniquely designed to combat specific toxic compounds.
Specific antidotes operate by inhibiting the enzymes that control biochemical pathways, reducing the production of harmful metabolites.
An example of an antidote is atropine, which counteracts the detrimental effects of cholinesterase inhibitors. It achieves this by deactivating muscarinic receptors,...

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Related Experiment Video

Updated: Jun 16, 2026

Assessment of Chemical Toxicity in Adult Drosophila Melanogaster
07:02

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Arsenic intoxication, a hemorheologic view.

A Bollini1, M Huarte, G Hernández

  • 1Cátedra de Física Biológica, Facultad de Ciencias Médicas, Universidad Nacional de Rosario, Rosario, Santa Fe, Argentina.

Clinical Hemorheology and Microcirculation
|February 6, 2010
PubMed
Summary
This summary is machine-generated.

Arsenic (As) exposure damages red blood cells (RBCs), altering their shape, deformability, and aggregation. This impairs blood flow, contributing to circulatory issues and anemia in chronic arsenic intoxication.

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Area of Science:

  • Toxicology
  • Hematology
  • Biochemistry

Background:

  • Arsenic (As) is a widespread toxic metalloid.
  • Arsenic exposure is linked to cardiovascular diseases.
  • Mechanisms of arsenic-induced circulatory obstruction are not fully understood.

Purpose of the Study:

  • To investigate the in vitro effects of pentavalent arsenic (As(V)) on human erythrocyte rheology.
  • To examine the relationship between As(V) exposure, erythrocyte membrane fluidity, and internal microviscosity.

Main Methods:

  • In vitro treatment of human erythrocytes with As(V).
  • Assessment of erythrocyte rheologic properties, including shape, deformability, and aggregation.
  • Evaluation of membrane fluidity and internal microviscosity.

Main Results:

  • As(V) treatment caused oxidative degradation of erythrocyte membrane lipids.
  • Internal microviscosity of erythrocytes was altered by As(V).
  • RBCs showed shape changes (to stomatocytes), reduced deformability, increased osmotic fragility, and enhanced aggregation.

Conclusions:

  • Arsenic-induced damage to RBCs alters their rheologic properties.
  • Impaired blood flow and anemia are consequences of these rheologic alterations.
  • Findings contribute to understanding arsenic toxicity mechanisms and associated circulatory problems.