Drugs are another issue that causes the respiration system
to be affected, however they have a different type of effect in humans. Drugs
affect the ventilation and the breathing rate which affects the cellular
respiration. Drugs slow down the brain activity the breathing rate, where the
number of breaths to inhale oxygen decreases which has an effect on the aerobic
respiration. Stimulants increases the brain activity and pain killers block the
nerve impulses. Each drug can effect respiration differently.

Cocaine tightens blood vessels, increases body temperature,
heart rate, and blood pressure. Huge quantities of cocaine may increase the
user’s high but can also lead to strange and violent behaviour. Cocaine users
report feelings of restlessness and paranoia. Users may also experience tremors,
and muscle spasms.

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Ketamine effects are visual, auditory distortions and
feeling detached from reality in users. The use of drugs can also cause nervousness,
memory loss, and weakened motor functions, including body tremors and numbness.
These effects, which depend on the amount of the drug taken, are also
unpredictable. Typically starting within minutes of ingestion and lasting for
hours, although drug’s effects can last for days after initial use.


Human activities produce a number of gases that are released
into the atmosphere. Most of these pollutant gases are produced by the burning
of fuels.

Factories can cause
air pollution

The burning of fuels releases a large amount of carbon
dioxide into the atmosphere. This is thought to cause global warming. Other
pollutant gases that are released when fuels are burned include carbon
monoxide, nitrogen oxides and sulphur dioxide. The incomplete combustion of
fuels also releases small particles of solids, such as carbon, into the air.
This makes buildings dirty and affects the lungs.

The effects of

Some of these
pollutants are directly harmful to humans. For example, carbon monoxide is
toxic and, if breathed in, can cause death. Others pollutants are harmful to
the environment which                             causes harm to
humans indirectly. For example, sulphur dioxide causes acid rain that can
damage or kill trees and crops.

Asbestos is a set of six naturally occurring silicate
minerals, thin fibrous crystals, with each visible fibre composed of millions
of microscopic “fibrils” that can be released by abrasion and other