Respiratory System Flashcards
What is respiration
The process of obtaining oxygen from environment and delivering it to cells
What are the 4 processes of respiration
Pulmonary ventilation
External gas exchange
Gas transport in the blood
Internal gas exchange
Air exchange between the atmosphere and the air sacs of the lungs; inhalation and exhalation. This describes?
Pulmonary ventilation
Describe external gas exchange
Oxygen diffuses from air sacs in the lungs into blood and carbon dioxide diffuses out of the blood
Blood moves oxygen and carbon dioxide between the lungs and the body tissues
Gas transport in the blood
Describe internal gas exchange
Oxygen diffuses from blood tissue cells and carbon dioxide passes from cells into blood
What is the mode of gas exchange
Diffusion
What are the main components of the respiratory system
Upper respiratory tract
And lower respiratory tract
Upper respiratory tract is composed of
Nasal cavities
Pharynx
Larynx
Lower respiratory tract consists of
Trachea (windpipe)
Bronchial tree
Lungs
Pleura
Respiratory mucosa is a
Mucous membrane that lines the respiratory tract
Respiratory mucosa secretes?
What are within this lining?
Secretes mucus
Goblet cells within this lining
Cilia on mucosal cells beat in only one direction moving mucus?
Upward to pharynx for removal
What are the 5 structures of the nose
Nares (nostrils)
Nasal septum
Two nasal cavities
Mucous membrane and cilia
Paranasal sinuses
Nasal septum contains 3 portions which are
Superior portion; ethmoid bone
Inferior portion; vomer bone
Anterior extension; cartilage
Paranasal sinuses consist of? Where do they drain into?
Maxillary, frontal, ethmoidal, sphenoidal
Drain into the nose
*prone to infection
What are the 4 functions of the nose
Filters foreign bodies
Warms and moistens inhaled air
Contains sense organs for smell
Sinuses resonate the voice and lighten skull bones
The pharynx carries air to
Respiratory tract and food to digestive system
Nasopharynx location and what it consists of?
Superior portion behind the nasal cavity
-pharyngeal tonsils and opening of auditory tubes
Oropharynx location and consists of?
Middle portion behind the mouth
-palatine tonsils
Laryngeal pharynx location
Inferior portion
Opens into the larynx toward the front and into the esophagus toward the posterior
What are the 3 functions of the pharynx
Passageway for food and liquids
Air distribution; passageway for air
Immune protection
The larynx is AKA? Where is it found?
Aka voice box
Found between the pharynx and trachea
Framework of the larynx consists of
Cartilage
Vocal folds
What is the epiglottis
Leaf shaped cartilage that covers larynx during swallowing
The vocal folds stretch across the
Interior of the larynx
What is the glottis
Space between vocal cords
The functions of the larynx is
Air passage to and from lungs
Voice production
The trachea is aka
Windpipe
The trachea is a tube that extends from larynx into the thoracic cavity. What is it composed of? What does it conduct?
Composed of cartilage rings that hold trachea open
Conducts air between the larynx and the lungs
Blockage of the trachea occludes the airway and if complete causes
Death in minutes
The bronchi, bronchioles and alveoli together make up the
Respiratory tree
Trachea divides into
2 primary bronchi that enter the lungs
(Right bronchus is considerably larger in diameter than the left and extends downward)
Each bronchus branches into smaller and smaller tubes (secondary bronchi) eventually leading to
Bronchioles
Bronchioles subdivide into alveolar ducts and end in
Alveolar sacs (clusters of microscopic alveoli)
What is the hilum
A notch or depression found where the bronchus entered the lungs
-blood vessels and nerves connect with the lung here
What occurs at the alveoli
External gas exchange
(Single layer epithelium = east passage)