Chapter 23 Flashcards
General Functions of Respiratory System
provides the means for gas exchange
Mucosa
mucous membrane; respiratory lining; contains mucin protein and enzymes that defend against microbes
Nose
first conducting structure for inhaled air; formed by bone, hyaline cartilage, dense irregular connective tissue, and skin
Nares
(nostrils) made of dense irregular connective tissue
Nasal Bones
paired nasal bones form bridge of nose
Lateral Cartilage
middle of nose
Alar Cartilage
distal end of nose
Nasal septum
divides left and right sides
nasal conchae
three paired, bony projections on lateral walls of nasal cavity; partition the nasal cavity into separate passages
nasal vestibule
just inside nostrils; lined by skin and particle-trapping hairs called vibrissae
Olfactory region
superior part of nasal cavity containing olfactory epithelium
Respiratory Region
lined by pseudostratified ciliated columnar epithelium with an extensive vascular network
Nasolacrimal Ducts
drain lacrimal secretions from eye surfaces to nasal cavity
Paranasal Sinuses
spaces within skull bones; named for specific bone in which they are housed; connected by ducts to nasal cavity; lined by pseudostratified ciliated columnar epithelium (Frontal, ethmoidal, maxillary)
Pharynx
funnel-shaped passageway posterior to nasal cavity, oral cavity, and larynx; lateral walls composed of skeletal muscles
Nasopharynx
most superior part of pharynx; pseudostratified ciliated columnar epithelium; air passage; contains tonsils
Oropharynx
middle pharyngeal region; posterior to oral cavity; passageway for both food and air; lined by nonkeratinized stratified squamous epithelium
Laryngopharynx
inferior, narrow region of pharynx; posterior to the larynx; both food and air; lined by nonkeratinized stratified squamous epithelium
Larynx
cylindrical airway between laryngopharynx and trachea
Functions of the larynx
air passageway, prevent ingested materials from entering respiratory tract; produces sound for speech; participates in sneeze and cough reflexes
Laryngeal inlet
connects pharynx and larynx; Entry point
Thyroid Cartilage
large, shield-shaped; forms lateral and anterior walls of larynx
cricoid cartilage
ring-shaped; just inferior to thyroid cartilage
Epiglottis cartilage
spoon-shaped; anchored to the inner aspect of thyroid cartilage; projects posterosuperior into the pharynx; crosses over laryngeal inlet during swallowing
Vocal Ligaments
extend between thyroid and arytenoid cartilages; avascular elastic connective tissue
vestibular ligaments
extend from thyroid cartilage to arytenoid and corniculate cartilages
vocal folds
mucosa covering vocal ligaments
Rima glottidis
opening between ligaments
Glottis
rima glottidis and vocal folds
Trachea
open tube connecting larynx to main bronchi
tracheal cartilages
support anterior and lateral walls; c-shaped rings of hyaline cartilage
Carina
internal ridge at the inferior end of trachea containing many sensory receptors
bronchial tree
system of highly branched air passages
main bronchi
right and left; enters a lung on its medial surface; right bronchus shorter, wider, and more vertically oriented
lobar bronchi
extends into a lobe of the lung; smaller in diameter;
Segmental bronchi
tertiary bronchi
Bronchioles
tubes less than 1 milimeter
bronchoconstriction
less air through bronchial tree
bronchodilation
more air through bronchial tree
Alveolar ducts
lead to alveolar sacs
alveolar sacs
clusters of alveoli
alveoli
saccular outpockets
alveolar type 1 cells
most common; 95% of alveolar surface area; form the alveolar epithelium
alveolar type 2 cells
secrete oily pulmonary surfactant
Alveolar macrophage
leukocytes that engulf microorganisms; either fixed in alveolar wall or free to migrate
Costal surface
adjacent to ribs
mediastinal
adjacent to mediastinum
diaphragmatic
adjacent to diaphragm
Base
wide concave section atop diaphragm
Apex
points superiorly just behind clavicle
Hilum
indented region on lung’s mediastinal side
Root
bronchi, pulmonary vessels, autonomic nerves, lymph vessels pass through
Lobes
right lung has 3 lobes; left has 2 lobes
Horizontal Fissure
separates superior and middle lobes
oblique fissure
separates middle lobe from inferior lobe
Bronchopulmonary segments:
10 segments in right lung 8-10 in left lung; autonomous units encapsulated with connective tissues; each supplied with its own segmental bronchus; can be removed individually
Innervations
ANS innervates smooth muscles and glands of respiratory structues
Pleura
serous membrane lining lung surfaces and thoracic wall; composed of simple squamous epithelium and areolar CT
Visceral Pleura
adheres to lung surface
Parietal pleura
lines internal thoracic walls, lateral surface of mediastinum and superior surface of diaphragm
Pleural cavity
located between visceral and parietal serous membranes
diaphragm
contraction causes flattening of diaphragm during inspiration and thus expands thoracic cavity; increases pressure in abdominopelvic cavity
Serratus posterior superior
elevates ribs during respiration
serratus posterior inferior
depresses ribs during respiration
Scalenes
flex neck when 1st rib is fixed; elevate 1st and 2nd ribs during forced respiration
External intercostals
elevate ribs during forced and quiet inspiration
internal intercostals
depress ribs during forced expiration
transverse thoracis
depresses ribs during forced expiration
provides the means for gas exchange
General Functions of Respiratory System
mucous membrane; respiratory lining; contains mucin protein and enzymes that defend against microbes
Mucosa
first conducting structure for inhaled air; formed by bone, hyaline cartilage, dense irregular connective tissue, and skin
Nose
(nostrils) made of dense irregular connective tissue
Nares
paired nasal bones form bridge of nose
Nasal Bones
middle of nose
Lateral Cartilage
distal end of nose
Alar Cartilage
divides left and right sides
Nasal septum
three paired, bony projections on lateral walls of nasal cavity; partition the nasal cavity into separate passages
nasal conchae
just inside nostrils; lined by skin and particle-trapping hairs called vibrissae
nasal vestibule
superior part of nasal cavity containing olfactory epithelium
Olfactory region
lined by pseudostratified ciliated columnar epithelium with an extensive vascular network
Respiratory Region
drain lacrimal secretions from eye surfaces to nasal cavity
Nasolacrimal Ducts
spaces within skull bones; named for specific bone in which they are housed; connected by ducts to nasal cavity; lined by pseudostratified ciliated columnar epithelium (Frontal, ethmoidal, maxillary)
Paranasal Sinuses
funnel-shaped passageway posterior to nasal cavity, oral cavity, and larynx; lateral walls composed of skeletal muscles
Pharynx
most superior part of pharynx; pseudostratified ciliated columnar epithelium; air passage; contains tonsils
Nasopharynx
middle pharyngeal region; posterior to oral cavity; passageway for both food and air; lined by nonkeratinized stratified squamous epithelium
Oropharynx
inferior, narrow region of pharynx; posterior to the larynx; both food and air; lined by nonkeratinized stratified squamous epithelium
Laryngopharynx
cylindrical airway between laryngopharynx and trachea
Larynx
air passageway, prevent ingested materials from entering respiratory tract; produces sound for speech; participates in sneeze and cough reflexes
Functions of the larynx
connects pharynx and larynx; Entry point
Laryngeal inlet
large, shield-shaped; forms lateral and anterior walls of larynx
Thyroid Cartilage
ring-shaped; just inferior to thyroid cartilage
cricoid cartilage
spoon-shaped; anchored to the inner aspect of thyroid cartilage; projects posterosuperior into the pharynx; crosses over laryngeal inlet during swallowing
Epiglottis cartilage
extend between thyroid and arytenoid cartilages; avascular elastic connective tissue
Vocal Ligaments
extend from thyroid cartilage to arytenoid and corniculate cartilages
vestibular ligaments
mucosa covering vocal ligaments
vocal folds
opening between ligaments
Rima glottidis
rima glottidis and vocal folds
Glottis
open tube connecting larynx to main bronchi
Trachea
support anterior and lateral walls; c-shaped rings of hyaline cartilage
tracheal cartilages
internal ridge at the inferior end of trachea containing many sensory receptors
Carina
system of highly branched air passages
bronchial tree
right and left; enters a lung on its medial surface; right bronchus shorter, wider, and more vertically oriented
main bronchi
extends into a lobe of the lung; smaller in diameter;
lobar bronchi
tertiary bronchi
Segmental bronchi
tubes less than 1 milimeter
Bronchioles
less air through bronchial tree
bronchoconstriction
more air through bronchial tree
bronchodilation
lead to alveolar sacs
Alveolar ducts
clusters of alveoli
alveolar sacs
saccular outpockets
alveoli
most common; 95% of alveolar surface area; form the alveolar epithelium
alveolar type 1 cells
secrete oily pulmonary surfactant
alveolar type 2 cells
leukocytes that engulf microorganisms; either fixed in alveolar wall or free to migrate
Alveolar macrophage
adjacent to ribs
Costal surface
adjacent to mediastinum
mediastinal
adjacent to diaphragm
diaphragmatic
wide concave section atop diaphragm
Base
points superiorly just behind clavicle
Apex
indented region on lung’s mediastinal side
Hilum
bronchi, pulmonary vessels, autonomic nerves, lymph vessels pass through
Root
right lung has 3 lobes; left has 2 lobes
Lobes
separates superior and middle lobes
Horizontal Fissure
separates middle lobe from inferior lobe
oblique fissure
10 segments in right lung 8-10 in left lung; autonomous units encapsulated with connective tissues; each supplied with its own segmental bronchus; can be removed individually
Bronchopulmonary segments:
ANS innervates smooth muscles and glands of respiratory structues
Innervations
serous membrane lining lung surfaces and thoracic wall; composed of simple squamous epithelium and areolar CT
Pleura
adheres to lung surface
Visceral Pleura
lines internal thoracic walls, lateral surface of mediastinum and superior surface of diaphragm
Parietal pleura
located between visceral and parietal serous membranes
Pleural cavity
contraction causes flattening of diaphragm during inspiration and thus expands thoracic cavity; increases pressure in abdominopelvic cavity
diaphragm
elevates ribs during respiration
Serratus posterior superior
depresses ribs during respiration
serratus posterior inferior
flex neck when 1st rib is fixed; elevate 1st and 2nd ribs during forced respiration
Scalenes
elevate ribs during forced and quiet inspiration
External intercostals
depress ribs during forced expiration
internal intercostals
depresses ribs during forced expiration
transverse thoracis