Download - Respiratory System
Respiratory System• It is a system that consist of organs and
structures used for the process of respiration in an organism• Involved in the intake and exchange of
oxygen and carbon dioxide• Gas exchange• Immunity functions
Nostril• It is the part of the respiratory system in
which the air enters into and exits from the body
Nasal Cavity• A large air-filled space above and behind
the nose in the middle of the face• The air passing the nasal cavity is warmed
within 1 degree of the body temperature• Cilia – removes dusts and pathogens from
the air as it flows through the nasal cavity
Pharynx• It is part of the throat that is behind the
mouth and nasal cavity and above the esophagus and the larynx • A tubular structure that allows the air to
pass through from the nose to the lungs• Nasopharynx – upper portion of the
pharynx that is behind the nose and surrounded by muscles that can continue the respiratory function
Larynx• Commonly known as the “voice box”• Sounds are generated in the larynx; where
pitch and volume are manipulated• Prevention of foreign objects from
entering the lungs by coughing out
Trachea• Also called as the “windpipe”• A cartilaginous tube that connects the
pharynx and the larynx to the lungs• Passageway of air• 10-16 centimeters in length
Bronchi• Airway in the respiratory tract that
conducts air into the lungs• Right Main Bronchus – wider, shorter and
more vertical than the left bronchus. It enters in the right side of the lung• Left Main Bronchus – longer than the right
bronchus. It enters in the left side of the lung
Lungs• Primary organs of respiration in humans • Located in the chest on either side of the
heart in the rib cage• Right Lung – has 3 lobes• Left Lung – has 2 lobes• Its function are breathing, respiration and
protection from infection
Inhalation• Drawing in oxygen into the lungs• It is a vital process in human life• Contraction of muscles in the rib cage; this
causes the expansion of the chest cavity• Contraction of the diaphragm
Exhalation• Flow of the air out of the organism• The main reason of exhalation is to get rid
of the carbon dioxide, which is a waste product of the gas exchange, inside the body