I. INRODUCTION
Respiratory System is a system of organs sub serving the
functions of respiration and in air-breathing vertebrates consisting
typically of the lungs and their nervous and circulatory system supply
and the channels by which these are continuous with the outer air. It
contains organs that are involved in breathing. This includes the nose,
throat, larynx, trachea, bronchi, and the lungs. Also known as the
respiratory tract. It is also a system of the body responsible of taking in
O2, and excreting CO2, and regulating the relative composition of the
blood.
And most of all, respiratory system is the biological system of
any organism that engages in gas exchange of any organism that
engages in gas exchange. Even trees have their respiratory system,
taking in carbon dioxide and emitting oxygen during the day,
consuming oxygen and producing carbon dioxide constantly.
II. FUNCTIONS
A. Gas exchange
The cellular respiration involves the breakdown of the organic
molecule that produces ATP Carbon dioxide is also generated by
cellular metabolism and must be removed from the cell. The animals
have organ system involved in the facilitating this exchange as well as
the transport of gases o and from exchange areas. The process
continues simultaneously as carbon dioxide leaves the cell the oxygen
will enter the cell.
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, III. STRUCTURE AND RESPIRATION IN ANIMALS
A. Gills
The gills greatly increased the surface area for gas
exchange. It occurs in the variety of animals groups including the
arthropods, annelids, fish, and amphibians. The gills convolute
outgrowths containing blood vessels covered by a thin layer of
epithelial layer. They are organized in a series of plates namely;
internal as in crabs and fish and external to the body as in some
amphibians.
B. Tracheal System/Trachea
Terrestrial animals have their respiratory surfaces inside
the body and connected to the outside in series of tubes. This
tube carries air directly to cells for gas exchange. The spiracles
are small openings at the body surface that lead to trachea.
The tracheoles are the smaller tubes of the trachea. The
trachea will not function well in the animals whose body is longer
than 5 cm.
C. Lungs
It is ingrowths of the body wall in animals and connect to
the outside by a series of tubes and small openings. Not entirely
the sole property of vertebrates, some terrestrial snails have a
gas exchange structures similar to those of frogs.
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