Respiratory system 1 Flashcards
Pulmonary Ventilation
What is the respiratory system?
Airflow to/from the lungs
External Respiration
What is the respiratory system?
Gas exchange b/w lungs and pulmonary circulation
Internal Respiration
What is the respiratory system?
Gas exchange b/w systemic circulation and tissues
Homeostasis requires
Respiration Overview
Steady supply of O2 and elimination of CO2
Disruption of homeostasis
Respiration Overview
Oxygen starvation, waste buildup, rapid cell death
Respiratory and Cardiovascular system work together
Respiration Overview
Respiratory system provides gas exchange and cardiovascular system transports respiratory gases
Functions of respiratory system
- Provide surface for gas exchange
- Move air to and from exchange surfaces
- Protect respiratory surfaces from dehydration, temp changes, pathogen invasion
- Produce sounds for speaking
- Detect odors
Respiratory tract consists of
Nose, pharynx, larynx, trachea, bronchi, bronchioles, alveoli
Respiratory tract
Respiratory tract consists of
Passageway that carries air to/from gas exchange surfaces of lungs
Conducting portion
Respiratory tract consists of
Nasal cavity to bronchioles, no gas exchange
Respiratory portion
Respiratory tract consists of
Smallest bronchioles to alveoli, gas exchange occurs
Upper Respiratory Tract
Respiratory tract consists of
- Nose, nasal cavity, paranasal sinus, pharynx. Filters, warms,
- humidifies incoming air
Lower Respiratory Tract
Respiratory tract consists of
- Larynx, Trachea, Bronchi, Bronchioles, Alveoli.
- Conducts air to and from gas exchange surfaces
Respiratory Mucosa
Respiratory Epithelia
Lines nasal cavity through large bronchioles. Pseudostratified ciliated columnar epithelium with mucous cells
Lamina propria
Respiratory Epithelia
Underlying areolar tissue that supports respiratory epithelium
Mucociliary Escalator
Respiratory Epithelia
Sticky mucous glands produce mucus that traps debris. Debris swept up to pharynx by cilia
Nostrils/External Nares
Nose/Nasal Cavity
openings for air entering into respiratory system
Dorsum of nose/maxilla/frontal bones
Nose/Nasal Cavity
Bony framework of external nose
Nasal cartilages
Nose/Nasal Cavity
Elastic cartilages to help keep nostrils open
Choanae
Nose/Nasal Cavity
Where nasal cavity communicates with pharynx
Nasal vestibule
Nose/Nasal Cavity
Lined with coarse hairs to filter dust particles
Respiratory Region of Nasal Cavity
Nose/Nasal Cavity
Larger, inferior portion. Lined with non-keratinized pseudostratified ciliated columnar epithelium and goblet cells
Olfactory Region of Nasal Cavity
Nose/Nasal Cavity
Smaller superior portion. Olfactory receptors, have cilia but no goblet cells
Nasal Septum
Nose/Nasal Cavity
Forms right and left nasal cavities.
Superior, inferior, middle nasal meatuses
Nose/Nasal Cavity
Trap small particles, move odorants to olfactory receptors, warm/humidify air
Paranasal sinuses
Nose/Nasal Cavity
Secrete mucus to moisten nasal cavity, resonate sound, lighten skull
Nasal Polyps
Nose/Nasal Cavity
Outgrowth of mucus membranes, usually around paranasal sinuses
Nasolacrimal duct
Nose/Nasal Cavity
Carry tears from lacrimal sac to nasal cavity
Lamina Propria of Nasal Cavity
Nose/Nasal Cavity
Release heat to warm air, humidify inhaled air, reabsorb heat during exhalation
Main functions of Pharynx
Pharynx (AKA throat)
passage of food/air, resonating chamber for speech, tonsils preventing entry to body
Nasopharynx
Pharynx (AKA throat)
Superior part, has auditory (eustachian tubes) and tonsils
Oropharynx
Pharynx (AKA throat)
Middle part
Laryngopharynx
Pharynx (AKA throat)
Inferior part
Larynx
Cartilaginous tube surrounding glottis (voice box)
Larynx Location
Larynx
Anterior to C4-C6
Epiglottis
Larynx
Forms lid over glottis, protecting from entry to respiratory tract during swallowing
Thyroid Cartilage
Larynx
Contains adam’s apple and attaches to hyoid bone
Cricoid cartilage
Larynx
Forms ring around larynx, providing attachment for muscles
Glottis
Larynx
Where air passes through larynx
Rima glottis
Larynx
Opening between Vocal Folds in the Glottis
Vocal Folds (AKA Vocal Cords)
Larynx
Tissue folds containing vocal ligaments and produce sound waves
Phonation
Larynx
Sound production from larynx
Articulation
Larynx
Modification of sounds from tongue, teeth, lips
Sound Production
Larynx
Bands of elastic ligaments stretch b/w laryngeal cartilages
Pitch
Larynx
Depends on tension of vocal folds
Volume
Larynx
Depends on pressure of air
Ventricular folds
Larynx
Aka false vocal cords, located above true vocal cords
Trachea starts
Trachea
C6-T5 by branching into bronchi, lying in front of esophagus
Tracheal Cartilages
Trachea
Prevent collapse and overexpansion
Carina
Trachea
Ridge at base that separates the openings of right and left bronchi
Trachealis
Trachea
Muscles that can restrict airflow, mostly controlled by sympathetic stimulation
Main bronchi (Primary bronchi)
Bronchi
First division of bronchi, right and left bronchus go into each lung
Right bronchus
Bronchi
Wider and steeper angle than left
Lobar Bronchi (Secondary bronchi)
Bronchi
One to each lobe of lung, 3 to right, 2 to left
Segmental Bronchi (Tertiary bronchi)
Bronchi
Each lung contains about 10, and supplies one segment of lung
Bronchopulmonary segment
Bronchi
A triangular segment of lung that the segmental bronchi supplies
Structure
Bronchioles
Thick smooth muscle
Bronchodilation
Bronchioles
Airflow increase caused by sympathetic nervous system
Bronchoconstriction
Bronchioles
Airflow decrease caused by parasympathetic nervous system
Asthma
Bronchioles
Reactions causing extreme bronchoconstriction
Terminal Bronchioles
Bronchioles
Lead to pulmonary lobules, where gas exchange occurs
Respiratory bronchioles
Bronchioles
Last division
Lobes of Right Lung
Gross Anatomy of Lungs
3, superior, middle, inferior
Lobes of left lung
Gross Anatomy of Lungs
2, superior and inferior
Fissures
Gross Anatomy of Lungs
Divide lung lobes, right lung has 2 fissures, lefts lung has one
Lung location
Gross Anatomy of Lungs
Apex at first rib and base at diaphragm
Cardiac Notch
Gross Anatomy of Lungs
On the left lung to accommodate heart
Root of Lung
Gross Anatomy of Lungs
Fixes positions of bronchi, nerves, vessels, lymphcatics
Hilum
Gross Anatomy of Lungs
Medial depression in each lung
Pleurae
Gross Anatomy of Lungs
Membrane sacs surrounding lungs
Visceral Pleura
Gross Anatomy of Lungs
covers outside of lungs
Parietal Pleura
Gross Anatomy of Lungs
Covers inner surface of thoracic wall
Pleural Cavity
Gross Anatomy of Lungs
Space b/w parietal and visceral layers, containing pleural fluid
Pulmonary Lobule
Microscopic Anatomy of Lungs
each terminal bronchiole supplies a single pulmonary lobule
Alveolar ducts
Microscopic Anatomy of Lungs
After respiratory bronchioles, leading to alveolar sacs
Alveolar Sacs
Microscopic Anatomy of Lungs
After alveolar ducts, where external respiration occurs
Pulmonary alveoli
Microscopic Anatomy of Lungs
Give lungs spongy appearance, extensive capillary network for gas exchange
Type 1 Pneumocytes
Microscopic Anatomy of Lungs
thin, delicate sites of gas diffusion. Simple squamous
Type 2 Pneumocytes
Microscopic Anatomy of Lungs
Produce surfactant, oily secretion, to prevent collapse of alveoli
Alveolar Macrophages
Microscopic Anatomy of Lungs
Phagocytize particles that clog alveoli
Blood air barrier
Microscopic Anatomy of Lungs
Where gas exchange occurs