Chapter 2 (Part 1) Flashcards
The respiratory system is composed of
upper and lower respiratory tracts
movement of air in
and out of the airways
Ventilation
warms and filters inspired air
upper respiratory tract or upper airway
accomplish gas exchange or diffusion
lower respiratory tract
involves delivering oxygen to the tissues through the bloodstream and expelling waste gases, such as carbon dioxide, during expiration
Gas exchange
Upper airway structures consist of the
Nose
Paranasal Sinuses
Pharynx
Tonsils
Adenoids
Larynx
Trachea
passageway for air to pass to and from the lungs
Nose
It filters impurities and humidifies and warms the air as it is inhaled
Nose
include four pairs of bony cavities that are lined with
nasal mucosa and ciliated pseudostratified columnar epithelium
Paranasal sinuses
Paranasal sinuses
Frontal
Ethmoid
Sphenoid
Maxillary
Common site of infection
Sinuses
is a tubelike structure that connects the nasal and oral
cavities to the larynx
Pharynx or Throat
Three regions of pharynx
Nasal
Oral
Laryngeal
encircle the throat. These structures are important links in the chain of lymph nodes guarding the body from invasion by organisms entering the nose and the throat
tonsils, the adenoids, and other lymphoid tissue
functions as a passageway for the respiratory and digestive tracts.
Pharynx
is a cartilaginous epithelium-lined organ that connects the pharynx and the trachea
Larynx or voice box
Larynx consists of
Epiglottis
Glottis
Thyroid Cartilage
Cricoid Cartilage
Arytenoid Cartilages
Vocal Cords
it also protects the lower airway from foreign substances and facilitates coughing
Larynx
Larynx sometimes referred to as
watchdog of the lungs
is composed of smooth muscle with C-shaped rings
of cartilage at regular intervals.
Trachea or windpipe
Lower respiratory tract consists of
Lungs
are paired elastic structures enclosed in the thoracic cage, which is
an airtight chamber with distensible wall
Lungs
The lungs and wall of the thoracic cavity are lined with a serous membrane that called
Pleura
is in the middle of the thorax, between the pleural sacs that
contain the two lungs
Mediastinum
Acts as passageway
Bonchi and bronchioles
Site for gas exchange
Alveoli
Functions of Respiratory System
- Oxygen Transport
- Respiration
- Ventilation
- Gas exchange