hollow spaces in the head bones. Small openings connect them to the nasal cavity. Helps to regulate the temperature and humidity of air breathed in, as well as to lighten the bone structure of the head and give resonance to the voice.

is the preferred entrance for outside air into the Respiratory System. The hairs that line the inside wall are part of the air-cleansing system.

Air also enters through the mouth in people who have a mouth-breathing habit or whose nasal passages may be temporarily obstructed, as by a cold.

overgrown lymph tissue at the top of the throat. consisting of knots of cells and connecting vessels. helps resist body infection by filtering out foreign matter, including germs, and producing cells (lymphocytes) to fight them.

are lymph nodes in the wall of the pharynx that often become infected. They are an unimportant part of the germ-fighting system of the body. When infected, they are generally removed.

(throat) collects incoming air from the nose and passes it downward to the trachea (windpipe).

is a flap of tissue that guards the entrance to the trachea, closing when anything is swallowed that should go into the esophagus and stomach.

(voice box) contains the vocal cords. It is the place where moving air being breathed in and out creates voice sounds.

is the passage leading from the mouth and throat to the stomach.

(windpipe) is the passage leading from the pharynx to the lungs.

bones supporting and protecting the chest cavity. They move to a limited degree, helping the lungs to expand and contract.

The trachea divides into the two main tubes, one for each lung. These, in turn, subdivide further into bronchioles.

is divided into three LOBES, or sections.

two membranes, that surround each lobe of the lungs and separate the lungs from the chest wall.

(like very small hairs) The bronchial tubes are lined withCILIA that have a wave-like motion. This motion carries MUCUS.

(sticky phlegm or liquid) upward and out into the throat, where it is either coughed up or swallowed. The mucus catches and holds much of the dust, germs, and other unwanted matter that has invaded the lungs and thus gets rid of it.

is the strong wall of muscle that separates the chest cavity from the abdominal cavity. By moving downward, it creates suction to draw in air and expand the lungs.

The smallest subdivisions of the bronchi, at the end of which are the alveoli (plural of alveolus).

are the very small air sacs that are the destination of air breathed in.

blood vessels imbedded in the walls of the alveoli. blood discharges carbon dioxide into the alveoli and takes up oxygen from the air in the alveoli.

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breathing organs

pathways of air

Question	Answer
SINUSES	hollow spaces in the head bones. Small openings connect them to the nasal cavity. Helps to regulate the temperature and humidity of air breathed in, as well as to lighten the bone structure of the head and give resonance to the voice.
NASAL CAVITY	is the preferred entrance for outside air into the Respiratory System. The hairs that line the inside wall are part of the air-cleansing system.
ORAL CAVITY	Air also enters through the mouth in people who have a mouth-breathing habit or whose nasal passages may be temporarily obstructed, as by a cold.
ADENOIDS	overgrown lymph tissue at the top of the throat. consisting of knots of cells and connecting vessels. helps resist body infection by filtering out foreign matter, including germs, and producing cells (lymphocytes) to fight them.
TONSILS	are lymph nodes in the wall of the pharynx that often become infected. They are an unimportant part of the germ-fighting system of the body. When infected, they are generally removed.
PHARYNX	(throat) collects incoming air from the nose and passes it downward to the trachea (windpipe).
EPIGLOTTIS	is a flap of tissue that guards the entrance to the trachea, closing when anything is swallowed that should go into the esophagus and stomach.
LARYNX	(voice box) contains the vocal cords. It is the place where moving air being breathed in and out creates voice sounds.
ESOPHAGUS	is the passage leading from the mouth and throat to the stomach.
TRACHEA	(windpipe) is the passage leading from the pharynx to the lungs.
RIBS	bones supporting and protecting the chest cavity. They move to a limited degree, helping the lungs to expand and contract.
BRONCHI	The trachea divides into the two main tubes, one for each lung. These, in turn, subdivide further into bronchioles.
RIGHT LUNG	is divided into three LOBES, or sections.
LEFT LUNG	divided into two LOBES.
PLEURA	two membranes, that surround each lobe of the lungs and separate the lungs from the chest wall.
CILIA	(like very small hairs) The bronchial tubes are lined withCILIA that have a wave-like motion. This motion carries MUCUS.
MUCUS	(sticky phlegm or liquid) upward and out into the throat, where it is either coughed up or swallowed. The mucus catches and holds much of the dust, germs, and other unwanted matter that has invaded the lungs and thus gets rid of it.
DIAPHRAGM	is the strong wall of muscle that separates the chest cavity from the abdominal cavity. By moving downward, it creates suction to draw in air and expand the lungs.
BRONCHIOLES	The smallest subdivisions of the bronchi, at the end of which are the alveoli (plural of alveolus).
ALVEOLI	are the very small air sacs that are the destination of air breathed in.
CAPILLARIES	blood vessels imbedded in the walls of the alveoli. blood discharges carbon dioxide into the alveoli and takes up oxygen from the air in the alveoli.

Created by: johncl

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