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Related Concept Videos

Anatomy of the Brain: Major Regions01:20

Anatomy of the Brain: Major Regions

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The brain is the most complex organ in the human body. It consists of four main parts: the cerebrum, diencephalon, cerebellum, and brainstem.
The cerebrum is the largest section of the brain and divides into left and right hemispheres, separated by a deep fissure. The cerebral outer layer of grey matter — the cerebral cortex — comprises elevations called gyri and shallow groves called sulci. The inner portion of white matter includes long nerve fibers known as axons, which connect...
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Mutagenicity and Carcinogenicity01:25

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Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...
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Major Hormones and Their Functions01:27

Major Hormones and Their Functions

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Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and...
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Major Losses in Pipes01:28

Major Losses in Pipes

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When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...
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Major Organs of the Digestive System01:19

Major Organs of the Digestive System

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The digestive system is responsible for the ingestion of food, secretion of enzymes, mixing and digesting food, absorption of the nutrients and defecation. The human digestive system consists of two major parts: the gastrointestinal tract and the accessory digestive organs.
Gastrointestinal tract:
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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Related Experiment Video

Updated: Feb 11, 2026

Magnetic Resonance Imaging Assessment of Carcinogen-induced Murine Bladder Tumors
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Oxygen: our major carcinogen?

H Joenje

    Medical Hypotheses
    |September 1, 1983
    PubMed
    Summary

    Atmospheric oxygen acts as an environmental mutagen, potentially increasing cancer risk. Cellular antioxidant defenses protect against this oxygen genotoxicity, but understanding them may help minimize cancer incidence.

    Area of Science:

    • Environmental science
    • Molecular biology
    • Toxicology

    Background:

    • Atmospheric oxygen is an environmental mutagen.
    • Oxygen genotoxicity can be amplified by environmental factors.
    • Cellular antioxygenic defense systems prevent oxygen genotoxicity.

    Purpose of the Study:

    • To explore the role of atmospheric oxygen as an environmental mutagen.
    • To understand the cellular antioxygenic defense system.
    • To identify strategies for minimizing cancer incidence.

    Main Methods:

    • Review of accumulated evidence on oxygen genotoxicity.
    • Analysis of cellular antioxygenic defense mechanisms.
    • Exploration of environmental factors potentiating oxygen mutagenicity.

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    Major Components of the Light Microscope
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    Formation of Covalent DNA Adducts by Enzymatically Activated Carcinogens and Drugs In Vitro and Their Determination by 32P-postlabeling
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    Major Components of the Light Microscope
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    Main Results:

    • Oxygen is an established environmental mutagen.
    • Cellular antioxygenic defenses are crucial but not infallible.
    • Environmental factors can enhance oxygen's genotoxic effects.

    Conclusions:

    • Understanding cellular defenses against oxygen genotoxicity is key.
    • Minimizing exposure to potentiating environmental factors may reduce cancer risk.
    • Further research into antioxidant systems could lead to cancer prevention strategies.