General Toxicology: TOXICOLOGY Question and Answer bank
INTRODUCTION
TOXICOLOGY Question and Answer bank
is aimed to make the study of toxicology simple and understandable through
illustrations, images, custom made drawings, self-explanatory tables, and
questions and answers collated from standard and authoritative textbooks, and
widely scanned. The author’s own experience in different branches of toxicology
including environmental and veterinary toxicology has been abstracted in these
series of articles. This is first articles of series. The article has been
written in a manner to stimulate interest on various facets of the subject and
make it more exciting. It is general experience that theoretical description
does not attract as much attention and interest as the illustrations and
images. At the same time the information learnt through questions and their satisfactory
replies make the topics easier to grasp them.
The book provides comprehensive
quick reference for various examinations. However, it should be noted that this
series serve only as a supplement and not as a replacement for any textbook and
class room learning.
The series is expected to cover
several topics such as general toxicology, principles of toxicology, risk
assessment, disposition, mechanism of toxicity, toxic effects of various
xenobiotics, poisonings of poisonous and venomous organisms, plant toxins,
poisonous and food poisonings, radiation hazards and, abuse of drugs. The following
series will also the adverse effects on environment and ecosystem exposed to
various toxicants and poisonings as relevant to domestic and other animals.
Each article will be in the format
of questions and answers, multiple choice
questions, true and false statements or correct/ incorrect statements,
fill in blanks, and matching the statements that will be useful for students,
teachers and practicing in medical sciences, toxicology, pharmacology,
medicine, pharmacy, environmental toxicology and in veterinary sciences.
WHO
will be benefitted
The author believes that these
series would be:
Ø A good alternative to be used for various
courses and an excellent contribution for the students who needs a study aid
for toxicology but wants more than a textbook as they need a self-testing
regime.
Ø The
teachers of toxicology who needs inspiration when composing questions for their
students.
The
established toxicologists who wants to test their own knowledge of
understanding
the subject
matter.
Ø Will
be useful at universities and colleges, in industry for in-house training
courses in toxicology which I know exist in some pharmaceutical and chemical
companies
Ø
Required for studying
for the toxicology Boards and for preparation of different examinations.
Thus, the main strength of the series
will reflect the breadth and multi-disciplinary nature of toxicology with
illustrative approach to the subject that is needed to improve engagement with
and understanding of the subject having
a very wide audience.
Toxicology is a rapidly evolving
field. Suggestions and comments are welcome to help the author improve the
contents of the series. Please also suggest or send comments at drpkg_brly@yahoo.co.in or drpkg1943@gmail.com
GENERAL TOXICOLOGY
Q. What is toxicology?
Toxicology is the study of the adverse effects of
chemicals or physical agents on living organisms. The word ‘toxicology’ is derived from the Greek word ‘toxicon’ which means ‘poison’ and logos means to study.
It also includes study of special effects of toxicants developmental toxicity, teratogenicity,
carcinogenicity, mutagenesis, immune-toxicity, neurotoxicity, endocrine
disruption, etc.
Q. Who is the
father of rational medicine?
Hippocrates (460-375 BC) is regarded as the “Father of
Rational Medicine”. He created the Hippocratic oath. He believed that disease
came naturally and not from superstitions and GOD. He advocated hot oil as an
antidote in poisoning and induced vomiting to prevent absorption of the
poisons.
Q.
What do you know about Paracelsus?
Hohenheim-Paracelsus
(1493–1541) a first century Roman physician, who promoted a focus on the
toxicon, the toxic agent, as a chemical entity. He recognized the dose-response
concept and in one of his writings stated, “All substances are poisons, there
is none which is not a poison. The right dose differentiates a poison and a
remedy”.
Q. Who is Friedrich Serturner? What
is his contribution?
Friedrich Serturner (1783-1841),
German pharmacist who isolated the specific narcotic substance from opium and
named as morphine after Morpheus, the Roman God of sleep.
Q. Who is a Father of Toxicology?
M J B (Mattie Josesph Benaventura)
Orfila (1787-1853), a Spanish physician is a considered as “Father of
Toxicology”.
Q. Describe main contributions of M
J B Orfila (1787-1853).
He
established toxicology as a discipline distinct from others and defined
toxicology as the study of poisons. He advocated the practice of autopsy
followed by chemical analysis of viscera to prove that poisoning has taken
place. His “treatise” Traite des Poisons published in 1814 laid the foundations
of forensic toxicology.
Q.
Who is father of experimental pharmacology?
Describe in brief his contributions.
Francois Magendie (1783-1855) is
known as the “Father of Experimental Pharmacology”, a pioneer French physiologist
and toxicologist studied the mechanism of action of emetine, morphine, quinine, strychnine and other alkaloids.
Q. Who was Claude Bernard?
Claude Bernard (1813-1878) was
a French physiologist who is considered the "Father" of Modern
Experimental Physiology. Claude Bernard's first important works were carried
out on the physiology of digestion, particularly the rôle of the pancreas
exocrine gland, the gastric juices and of the intestines. In addition to this,
Bernard also made other important contributions to the neurosciences.
Q.
Who was Louis Lewin (1854-1929)?
Louis
Lewin (1854-1929) was a German scientist who took up the task of classifying
drugs and plants in accordance with their psychological effects. He also
published many articles and books dealing with toxicology of methyl alcohol,
ethyl alcohol, chloroform, opium, and some other chemicals. His important
publications are “toxicologist’s view of world history” and “A textbook of
toxicology”.
Q.
Who discovered the insecticidal properties of DDT? What is his major
contribution?
Paul
Hermann Muller in 1939 discovered they of insecticidal properties of
dichlorodiphenyltrichloroethane (DDT) .He was awarded Nobel Prize in 1948 “for his
discovery of the high efficiency of DDT as a contact poison against several
arthropods”.
Q. Who is “Father of Nerve Agents”?
Gerhard Schrader (1903-1990) was a
German chemist who accidentally
developed the toxic nerve agents serin, tabun, soman, and cyclosarin while attempting to develop new insecticides.
Schrader and his team, thus, introduced a new class of synthetic insecticides,
the organophosphorus insecticides (OP), and defined the structural
requirements for insecticidal activity of anticholinesterase (AChE) compounds.
He is known as the “Father of Nerve Agents”.
Q. Who is Rachel Carson
(1907-1964)?
Rachel Carson 1962:
started crusade against the use of DDT and published the great book “Silent
Spring”.
Q. What is Poison
Poison is any solid, liquid, gas
that, when introduced into or applied to the body, can interfere with the life
processes of cells of the organism. These effects occur by its own inherent
chemical properties without acting mechanically and regardless of temperature.
Q. What is xenobiotic
xenobiotic is any substance, harmful
or not, that is foreign to the body
Q. What is toxin
Any poison of biological origin is
known as toxin
Q. What is another name for a poison?
Toxicant
Q. What category of toxins are
encountered in our life?
bacterial (endotoxins, exotoxins),
fungal (mycotoxins),
plant (phytotoxins),
animal (zootoxins),
algal (phycotoxins)
Q. What toxicants are encountered in veterinary
practice/ medicine?
pesticides,
drugs (animal and human),
household chemicals,
workplace chemicals,
feed additives,
poisonous gases
Q. What is toxic
The chemical that has the properties
of a poison
Q. What is toxicity
amount of poison that, under a
specific set of conditions, will cause a detrimental effect (agents are usually
compared on a mg/kg basis, toxicity is not the condition produced by the
toxicant)
Q. What is toxicosis
the condition (dz state) produced by
the toxicant
what are other terms for toxicosis?
Q.
What is
venom
Venom is a toxicant synthesized in a
specialized gland and ejected by the process of biting or stinging. Venom is
also a zootoxin but is transmitted by the process of biting or stinging.
Q.
What is
pollutant
It is any undesirable substance solid, liquid
or gaseous matter resulting from the discharge or admixture of noxious
materials that contaminate the environment and contributes to pollution.
Q. What is
systemic toxicant
It is a toxicant that affects the entire body
or many organs rather than a specific site. For example, potassium cyanide is a
systemic toxicant that affects virtually every cell and organ in the body by
interfering with the cell’s ability to utilize oxygen.
Q. What is
organ toxicant
It is toxicant that
affects only specific organs or tissues (may be called tissue toxicant) while
not producing damage to the body as a whole. For example, benzene is a specific
organ toxicant in that it is primarily toxic to the blood-forming tissues.
Q. What is
transient or reversible or temporary toxicity
It is the toxicity or harmful effect that
remains for short duration of time. e.g., narcosis produced organic solvents.
Q. What is
persistent or permanent or irreversible toxicity
It is the toxicity or harmful effects that
persists throughout life span of the individual and are of permanent nature,
e.g. scarring of skin produced by corrosives.
Q. What is
immediate toxicity
It is the toxicity
that develops shortly after a single exposure to a toxicant e.g. cyanide
poisoning.
Q. What is delayed toxicity
It is the toxicity or harmful effect which
has delayed onset of action, e.g. peripheral neuropathy produced by some organophosphorus insecticides
and radiation sickness.
Q. What is
cumulative toxicity
It is progressive
toxicity or harmful effect produced by summation of incremental injury
resulting from successive exposures, e.g. liver fibrosis produced by ethanol.
a) accumulation of toxin: exposure to heavy metals (lead, mercury) that
have long half-lives result in disease due to metal accumulation.
b) accumulation of effect: low level exposure to organophosphate
pesticides depresses acetylcholine esterase to a point where symptoms occur.
Q.
What is
occupational (Industrial) toxicology
Occupational
(Industrial) toxicology is concerned with health effects from exposure to
chemicals in the workplace. It deals with the clinical study of workers of
industries and environment around him.
Q.
What is
regulatory toxicology:
It
deals with administrative functions concerned with the development and
interpretation of mandatory toxicology testing programs and controlling the
use, distribution and availability of chemicals used commercially and
therapeutically. For example, Food and Drug Administration (FDA) regulates
drugs, cosmetics and food additives. Regulatory toxicology gathers and
evaluates existing toxicological information to establish concentration-based
standards of “safe” exposure. The standard is the level of a chemical that a
person can be exposed to without any harmful health effects.
Q.
What do you mean by regulation
Regulation is the control, by
statute, of the manufacture, transportation, sale, or disposal of chemicals
deemed to be toxic after testing procedures or according
to be continued
FURTHER READING
Gupta PK (2018) Illustrative Toxicology with Question bank. 1st Edition. Elsevier, USA
Gupta
PK (2016) Fundamentals of Toxicology: Essential concepts and applications. 1st Edition. ISBN-9780128054260, pp 438, BSP/Elsevier, USA
The
Merck Veterinary Manual (2016). Chapter “Herbicide Poisoning” by PK GUPTA 11th
edition, Merck & Co. Inc Whitehouse Station, NJ, USA 2969-99
Gupta PK (2016) Essential Concepts in Toxicology. Published by PharmaMed Press (A unit of BSP Books Pvt. Ltd), Hyderabad, India pp 362.
Gupta PK
(2010) Modern Toxicology,
Basis of organ and reproduction toxicity. Vol 1. Published by Pharma Med Press (A unit of BSP Books Pvt. Ltd). Hyderabad, India pp 1-460.
Gupta PK
(2010) Modern Toxicology,
Adverse effects of xenobiotics. Vol 2, Published by PharmaMed Press (A unit of BSP Books Pvt. Ltd).
Hyderabad, India pp 1-460.
Gupta PK
(2010) Modern Toxicology,
Immuno and clinicsal toxicology Vol 3. Published by PharmaMed Press (A unit of BSP Books Pvt. Ltd).
Hyderabad, India pp 1-340.
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