asbestos dust
sawdust
nitrogen (II) oxide
carbon (II) oxide
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The selected answer is wrong:
The correct answer is A.A carcinogen is any substance, radionuclide, or radiation that is an agent directly involved in causing cancer. This may be due to the ability to damage the genome or to the disruption of cellular metabolic processes. Several radioactive substances are considered carcinogens, but their carcinogenic activity is attributed to the radiation, for example gamma rays and alpha particles, which they emit. Common examples of non-radioactive carcinogens are inhaled asbestos, certain dioxins, and tobacco smoke.
Asbestos is a group of naturally produced chemicals composed of silicon compounds. It is used in insulation materials due to heat resistance. Human exposure is through inhalation (from disruption of materials containing asbestos) and ingestion (contaminated food/water). Tiny asbestos fibers in the air can get trapped and accumulate in the lungs. Asbestos is linked to increased risk of lung cancer, and development of mesothelioma (cancer of the thin lining surrounding the lung (pleural membrane) or abdominal cavity (the peritoneum)) and laryngeal cancer. Cancer may appear 30 to 50 years after exposure. Asbestos is a known human carcinogen.
REF: http://www.psr.org/environment-and-health/confronting-toxics/examples-of-environmental-carcinogens.html
https://en.m.wikipedia.org/wiki/Carcinogen
The correct answer is A. asbestos dust.
A carcinogenic substance is something that can cause cancer.
* Asbestos dust: Asbestos is a fibrous mineral that was once widely used in building materials. When asbestos-containing materials are disturbed, tiny fibers can be released into the air and inhaled. These fibers can lodge in the lungs and over time, cause a type of cancer called mesothelioma, as well as lung cancer.
Let's look at the other options:
* B. Sawdust: While sawdust can be an irritant and may cause respiratory problems, it is not generally considered a strong carcinogen.
* C. Nitrogen (II) oxide: Nitrogen dioxide (NO₂) is a harmful air pollutant that can cause respiratory problems, but it is not a primary carcinogen.
* D. Carbon (II) oxide: Carbon monoxide (CO) is a poisonous gas that can be fatal, but it is not known to directly cause cancer.
okay so a carcinogenic substance is one that is involved in the development of cancer.
okie dokie
got it now
The role of reactive nitrogen species (RNS) in colon
carcinogenesis is multifactorial and affects diverse
processes, such as proliferation, apoptosis,
differentiation, tumorigenesis, and metastases. This
review describes the stages in colon carcinogenesis
where nitric oxide (NO) and inducible NO synthase
(NOS2) may influence the progression of a normal
mucosa to overt metastatic cancer.
